What he said. If you can find stainless braided lines for the car install them. This makes stopping easier and driving more enjoyable. Simply so, how do I know if my brake pedal is traveling? Use a rod or drift to stroke the piston slowly. The pedal travel is really starting to bother me. My brake pedal travels little less than halfway before it seems like it engages. Engine off, hard brake pedal, engine on, pedal will slowly go to the floor if you keep pressure on it. Equals 280 lbs. EXCESSIVE BRAKE PEDAL TRAVEL Possible causes include worn brake linings front or rear (or both), misadjusted drum brakes, or air in the brake lines. By the end of the day it felt like the pedal was at the floor by the time the brakes really started to grab. Which does not flow current in its normal state. BOT switch works as KILL SWITCH in condition of brake system failure. . There are times when a brake pedal can have a longer travel whenever you change your brake pads because the brake pedal is still adjusting. squirrel, Mar 27, 2020. Answer (1 of 3): Brake over travel(BOT) switch is additional safety feature in a car. The bite seems good. Fluid level is good and the color is still pretty clear. Recently, I have changed the master cylinder, bleed brakes, replaced front end struts. . For a normal brake job, this shouldn't be necessary. During the first session, the brake pedal travel started getting longer and longer. In that truck you have 4 wheel disc, that setup will have way more pedal travel than a disc/ drum setup, but what you are describing seems a little excessive. The different holes are used to change the pedal ratio. If your brake pedal is almost touching the fire wall then you got a major problem. Regardless of what you've been told, incorrect adjustment of the rear brake caliper can introduce play into the system. Then re-adjust the pedal height. I have 11" rotors in the back. . 8. lines are at fault. summary: I would bleed the brakes completely then go from there. The brake pedal on my '04 always seemed to have too much travel before the brakes engage. The pedal needs to travel 4.40 in. Most of your stopping power is on your front disc brakes. The rod can be rotated by hand, or with pliers if necessary. . [/b] Check the brake pedal reserve distance with the engine running. Then adjust more. This allows the power brake system to operate. 2004 Limited, 4.7 modded slightly, IRO 3" RockLink LA front, adjustable SA rear, Bilsteins, Addco bar, JKS disconnects. The long pedal travel tells me there's an issue in the rear brake system. Wheel model: Logitech G29. If that is the case, you should bleed the brakes to remove the excess air. AUTOMATIC. Clamp one of the master's mounting ears in a vise--don't grip around the cylinder--so the unit is as level as possible. Something is wrong, when the height or travel of the brake pedal changes. Adjust, drive it with the brakes warm and see. Its like the brakes are out of adjustment (they are automatic adjusting, though). Andy0557. Wait at least 15 seconds . Why does a brake pedal go to the floor? Only show this user. rear hoses and see if the pedal comes up. rear hoses and see if the pedal comes up. Most vacuum-boosted vehicles will have a 3.2:1 to 4:1 mechanical pedal ratio. Water makes the fluid easier to compress and gives the pedal a 'spongier' feel. You need to know where the brake pushrod is before you can adjust the height of the brake pedal. Also test the brake pipes yourself, get someone to slowly push on and off the . It is given by Formula Maximum Pedal travel = stroke of master cylinder pedal ratio Here, 1. Start the engine and with a little but not excessive effort, you can depress the brake pedal fully to the floor. The master is designed for discs all around at 8.4" rotors. Figures I would bleed the brakes. SHARE POST #5. June 8, 2016 at 3:44 am #860091. The universally accepted specification for brake shoe-to-drum clearance is .015 in. The brakes work well and have decent feel. you can adjust the pedal travel under the dash by loosening off the locknuts on the linkage, lengthening the rod that actuates the master cylinder. brake pedal travel The master is new and there are no residual valves in the system,. That said I was in a club race this week for 2 hours between FP, Quali and 60 minute race my brake foot toes were starting to go numb wearing socks, think I'll need shoes or slippers with a hard sole for . Table Of Contents. For power brake systems, the Brake Booster increases the force even more. It stayed this way for the rest of the weekend. Step 2 - Look for the Brake Push Rod. If I pump the brakes twice the pedal come up and it's where it "should be" in my opinion. Pumping the pedal a couple of times may cause the pedal height to rise somewhat, but the pedal will probably still feel somewhat soft. 3 Common Brake Pedal Problems. imo. A 4:1 pedal ratio. The P/U must have had a disk brake upgrade. The original brake pedals stick up from the floor, and they do have a lot of travel, you do have lift your leg up to push it, and it's difficult for some folks. This how my brakes behave. Feels like it's about 3/4 of the way to the floor before much of anything happens. 2004 Limited, 4.7 modded slightly, IRO 3" RockLink LA front, adjustable SA rear, Bilsteins, Addco bar, JKS disconnects. I think it is one of two problems: there is a brake pedal travel adjustment that isn't shown in the Chilton refera. Rotate the pushrod counterclockwise to decrease pedal height. There is a different master cylinder for the V6. EXCESSIVE BRAKE PEDAL TRAVEL Possible causes include worn brake linings front or rear (or both), misadjusted drum brakes, or air in the brake lines. Experienced too many agricultural excursions corner after corner. A brake is a mechanical device that inhibits motion by absorbing energy from a moving system. Then either install a rubber pad on the underside of the clutch cover or grind some material Off of the Top of the pedal arm. Jun 8, 2012. Another possible cause is a bad brake master cylinder. However, there are times when the issue can be due to having excessive air in the brake lines. You still want full travel of the master cylinder piston, before the pedal hits the floor. Sep 12, 2017. What you could try is clamping off the. I have factory power drums on two other '66 cars. Recently disabled ABS. Sep 23, 2008. This is from the Field Service Manual: ADJUST REAR DRUM BRAKE SHOE CLEARANCE. this will tell you if the mc is working and the rubber. This allows the power brake system to operate. Jan 18, 2011. Answer (1 of 3): Brake over travel(BOT) switch is additional safety feature in a car. I've recently replaced front discs and pads, and also . at the pedal. The tricky part for he has been learning to ease off the brake when there's so little travel and having to use felt pressure on my foot. Took it on the race track yesterday, tricky to heel and toe with a low brake pedal but braking is . Also, in my experience, poor or no rear braking will extend pedal travel dramatically. I'm told by my local, independent garage owner that the Avensis (and other makes) now have what is called a 'high boost . If you properly adjust the rear brakes the pedal travel should clear up. I think I have an issue with my brakes. Apply the brakes with a moderate force (about 20 lbs of force). Drove the gf's 3 a while back, and to me the brake pedal seemed to have a ton of travel. May 3, 2015. #1. Degraded brake fluid doesn't mean jt has air in the lines. Interesting. The idea is to place the clamp at the bodywork end of the flexible pipe so you isolate/remove that section of flexible brake pipe from the main circuit and possibly identify if a pipe is faulty. Symptom 2: The Brake Pedal Is Hard To Press. BOT switch is fitted behind the brake paddle. This is also a potentially dangerous condition because a worn master cylinder or a leak in the hydraulic system may cause the brakes to fail. BOT switch is ordinary NORMALLY OPEN SWITCH. Sales guy said if felt normal. This equates to about half of the total posible pedal travel before bottoming out on the . A master cylinder with a 1.10 in. This is the brake pushrod. If you can find stainless braided lines for the car install them. Received 40 Likes on 38 Posts. stroke. lines are at fault. Share on other sites. The brake pedal is nothing more than a mechanical lever that amplifies the force of the driver. I've also flushed the brake fluid and it is the same. Only show this user. imo. Strasburg Illinois. If your pedal travel is too long, lengthen it (a little). Another possible cause of a low pedal is a misadjusted brake system. Most brakes commonly use friction between two surfaces being compressed to convert the kinetic energy of the moving object into heat, although . This can be dangerous because the brake pedal may run out of travel before the brakes are fully applied. But it's safe to say you should replace the brake fluid via the bleeding process. To adjust your rear drum brakes you need to back up and hit your brakes. BOT switch is ordinary NORMALLY OPEN SWITCH. The travel acts like you have too much piston retraction, but don't know why. I am using High Temp (Motul) brake fluid plus after market racing pads and rotors. I recently noticed at a long stop light the Ranger's brake pedal started to fade down as I held . Brake Pedal Reserve is a measurement from the floorboard of the vehicle to the TOP of the brake pedal when the brakes are applied. this will tell you if the mc is working and the rubber. If your pedal is starting to travel closer to the floor then you have a problem. What is a brake? You shut the car off and you get a couple of assisted pumps from the pedal and then it gets hard and pedal travel is greatly reduced like any other power brake car. The longer brake fluid stays in the car the more water it absorbs. If I lightly pump the pedal an inch or so, this travel vanishes and the pedal is rock solid. I think your experience is pretty normal for factory 60's power disk brakes. Make VERY small adjustments. went around with the corner to corner method, kind of a PITA IMO because the tube wouldn't fit around the nipple . BOT switch is fitted behind the brake paddle. Engine off the pedal is hard. If the rear pads are too far away from the rotors, you will have increased pedal travel. Symptom 1: The Brake Pedal Is Soft Or Drops To The Floor. The brake pedal travels about half way and feels soft when braking but once i let go of the pedal and press it again its firm. BOT switch works as KILL SWITCH in condition of brake system failure. The process will also ensure the bleeding is complete. Symptom 3: Brake Pedal Pulsation. said they look good but you won't see the expansion. I have excessive brake pedal travel, and the harder I push the brake pedal the better the brakes stop the P/U: the brakes will not lock up regadless of how hard I press the brake pedal. Brakes don't pump up like a car with air in the lines. Only show this user. Brake Pedal Reserve is a measurement from the floorboard of the vehicle to the TOP of the brake pedal when the brakes are applied.Check the brake pedal reserve distance with the engine running. greenville mi. Location. travel at the master cylinder pushrod can equal about in. Apply the brakes with a moderate force (about 20 lbs of force). You have to check your master cylinder, pump your brake several times and hold it, see if is going down to the bottom, if does, the master cylinder is wrong, check the brake pressure hose, maybe you have some air in your brake lines, be sure you have enough brake fluid. Oct 14, 2018. If not ,then there is likely still air in the system or a problem with the master cylinder or linkage adjustment.. According to @Ike Carlson ; in a recent conversation, the orifice for the valve in the small-brake master cylinder will actually give a better pedal feel. Make sure you got all the air out of the front brakes, since you just put calipers on. How To Describe Brake Pedal Symptoms To Your Mechanic. Once it engages the brake pedal is hard like a lot of pressure is there. SOURCE: Brake pedal goes too far. The drum E-brake has nothing to do with pedal feel. The weird thing is at a stop the pedal goes basically all the way to the floor. The mounting position used would depend on the brake calipers, master cylinder size, and if the car had power or manual brakes. . The pedal maintains constant travel distance with constant pressure from my foot. Hi, I'm a new TOC member, having just bought a 2007 Avensis T180, with 37K miles. I also stayed with the 3/16" diameter brake lines and the pads are up flush against the rotors with no . As pedal height is increased the free-play will increase as well, so be careful not to increase the height too much. The brakes work as normal and pretty well, the pedal just travels quite a long way before feeling any pressure on the pedal. Brake pedal travel issues can be a pain to track down, easiest way I know to find the problem is to start at the master cylinder and plug the ports ( use correct fittings ) if pedal is soft than master cylinder is bad or needs bleed , if pedal is hard reconnect lines and move to the abs hydraulic unit and so on . Symptom 2: The Brake Pedal Is Hard To Press. said they look good but you won't see the expansion. I have replaced the brake fluid, bled the system, and adjusted the rear brakes with very little improvement. Tighten each adjuster all the way until it stops, pressing the pedal to settle things before taking up any further slack. See if there's fluid in the reservoir. The size of the booster's diaphragm and the amount of vacuum generated by the engine will . With the engine stopped and ignition keys removed the brake pedal can be locked hard with just one or two pumps, as expected, indicating the master cylinder and seals are good. It moves inches before the brakes even apply .then they work great. A: On average, brake pedal ratio should range from 5.1:1 to 7.1:1. #2. Pumping the pedal when you apply the brakes usually helps, but you need to diagnose and fix . Step 5. Every little bit of unnecessary movement adds up. Likes: 1. It is the internal travel distance of the master piston passed the fluid transfer hole which makes a huge difference on a stone stock, but well bled system. Symptom 3: Brake Pedal Pulsation. Just a consistent long pedal travel. How To Describe Brake Pedal Symptoms To Your Mechanic. What you could try is clamping off the. The drum is the E-brake though, activated by the console hand lever and the disc is the main vehicle brake that is activated by the pedal. Could be air in the system, or a master cylinder starting to go bad. The details are as follows:-. Try drilling holes 1/2" lower at a time. Brake Pedal Reserve. Stroke of master cyli. Diagnosing a low brake pedal requires an understanding of the principles involved. I looked at my brake pedal rod to see if it's adjustable, it doesn't seem to be unless the adjustable part is on the other side of the firewall and into the booster. Location. Worth a check, it's easy on the drum brakes. Car is 07 around 50k btw. The preload no longer works with the brake performance kit. Howdy! (To hold the brake drum in place) (b) Remove the hole plug, and turn the adjuster to expand the shoe until the drum locks. Occasionally a bad abs module can give these symptoms too. 3 Common Brake Pedal Problems. Apr 10, 2019. This will mean the brakes will come on a touch earlier. You could try clamping off all 4 brake hoses at the calipers and see if you have a normal travel brake pedal. June 8, 2016 at 3:44 am #860091. 2y. Answer (1 of 4): Pedal travel is a distance moved by pedal while braking. In the past, even with the pedal travel getting longer, with R10s in the front, I could brake at the 300 . Issue: brake pedal touches rubber stop, not fully depressed, onscreen telemetry reflects 100% braking output but input is below 100% . It doesn't just fall at. Literally no more than 1/4 to 1/2 turn of the rod at a time. When a brake pedal starts to travel too far before stopping, there is a problem. Every time I take it somewhere they said they don't see anything wrong. If you had a good pedal before the brake job most likely wouldn't be the rear brakes. Link to comment. Brake Pedal Reserve is a measurement from the floorboard of the vehicle to the TOP of the brake pedal when the brakes are applied. Apply the brakes with a moderate force (about 20 lbs of force). a) before starting the engine, the pedal has about 1" of travel. You should be snugging it up to prevent any mechanical play and wear. Set ABS to weak, marginal improvement then noticed the pedal telemetry. No need to disconnect anything regarding the ABS. Which does not flow current in its normal state. Whats going on with my brakes. EXCESSIVE BRAKE PEDAL TRAVEL Possible causes include worn brake linings front or rear (or both), misadjusted drum brakes, or air in the brake lines. Next, divide measurement A by measurement B. By design, brake pedal height and travel differ slightly from one vehicle to another. You must follow the rear pad and parking . That's about the best way to firm up a soft pedal, besides getting ALL the air out of the system. Do this several times and see if your pedal travel decreases. What Is The Brake Pedal And Its Role In The Braking System. The drum E-brake has nothing to do with pedal feel. Is the pedal just 'springy' or will the pedal 'pump up' and become firmer with less travel on repeated applications ('spongey') if the later then re bleed as James advises, if the former one thing worth checking especially if work has been carried out is it could be the rear pads are not located in the piston, the pads have a 'pip' o then which . Posted on Jul 27, 2008. The calipers are new (rear) and professionally rebuilt (front). I have used the 2 person method, vacuum bleeding . The drum is the E-brake though, activated by the console hand lever and the disc is the main vehicle brake that is activated by the pedal. in this thread in this sub-forum in the entire site. Well, one quarter turn on those rear adjusters made a huge difference. When I say a little, I mean 1/4 turn adjustment at a time. #2. I would estimate the brake pedal travels 2-3 inches before the brakes begin to apply. This allows the power brake system to operate. 1,199. Dec 6, 2017. My other vehicles have a small amount of pedal slack - 1/2" max before brake engagement. 2013 DC, pedal slowly crept closer and closer to the floor over the past few months and I have tried bleeding at least 5 times without any improvement. It is the internal travel distance of the master piston passed the fluid transfer hole which makes a huge difference on a stone stock, but well bled system. One of the more common causes for the brake pedal going to the floor is a loss of brake fluid. Maximum Pedal travel- maximum distance covered by pedal when piston touched IDC of Master cylinder. Hi guys, My girlfriend has a 2003 Cooper and the brake pedal travel is far longer than my 2005 JCW. Low brake pedal I have an 02 Cooper with the same problem. Every thousandth of an inch over spec causes excess brake pedal travel. You can judge the brake fluid by color if the age is unknown, fresh fluid is clear and it gets darker with age/contaminants. I only needed to press it down a couple inches (well before hitting the physical barrier) to get maximum braking during a few 50-10 mph tests. I've come across a few others with the same issue of excessive brake pedal travel. Maybe the excessive brake pedal travel has some correlation to the perceived braking defecit I seem to notice in these 3rd gen HL's. I would guess that the regenerative braking aspect of the HLH shortens stopping distance considerably, but at the cost of the excessive grab that comes with most regen brake systems as they initially engage. You must do it with the brakes warm though. 2. RV6 said: My bone stock 67 with original equipped power disk brakes has about 2 inches of travel before anything happens. Off to help with 5th grade homework. The top portion of the brake pedal is for the rear brakes and the further down you push on the pedal the front brakes are getting pressure applied. Dec 29, 2012. volvo9 said: Brakes are completely self adjusting. Less than .025 in. Symptom 1: The Brake Pedal Is Soft Or Drops To The Floor. Maybe the excessive brake pedal travel has some correlation to the perceived braking defecit I seem to notice in these 3rd gen HL's. I would guess that the regenerative braking aspect of the HLH shortens stopping distance considerably, but at the cost of the excessive grab that comes with most regen brake systems as they initially engage. (a) Provisionally install the hub nuts. . I think that the engine takes some of the vaccum used . How much travel are you talking about. What Is The Brake Pedal And Its Role In The Braking System. At the right side of the brake pedal is a rod that is connected to the brake pad level through the floor of your car into the engine.