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Heated Brakes?

 
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Old 05-04-2010, 10:39 PM
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Heated Brakes?

I've been noticing something now that the weather's warmer. On warm days, often when I've been driving for a while, I notice the brake pedal needs to be pushed down farther to stop my car. I actually had to move my seat up for it to not be uncomfortable, though I admit I used to sit farther back than most. I just want to know what's wrong as I almost bumped into another car today going 2mph or so as I didn't realize I was still moving at first. I don't do ridiculously heavy braking but the speed limits are 45 around here and there are a good number of lights and stop signs. The people who've looked at my brakes (two different auto shops for reasons aside from this) have told me they look brand new so I know it's not ridiculous wear or anything. Any help would be appreciated.
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Old 05-04-2010, 11:00 PM
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Re: Heated Brakes?

The principle of braking is simple: the pads create friction on the disc, in turn slowing the car down. Friction creates heat. Heat is the enemy of brakes.

Have you ever watched circuit racing at night? If not, look at this
[IMG][/IMG]
See the brake discs are red? They're hot.

Brakes tend to be effective for certain temperature ranges. OEM brakes generally often handle a track day because the continuous braking builds up heat that can't be dissipated, and when the brakes get too hot, the pads simply turn to mush.

This is the same principle as what's happenning to your car, though on a much lower level. I would say that you appear to have some very low temp pads in the car, and switching to maybe a slightly more sporty pad specification should solve the problem.
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Old 05-04-2010, 11:09 PM
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Re: Heated Brakes?

^^ Colin is entirely correct ^^



but there's a possibility that you might have a slight leak in the brake system. have you been noticing a loss in brake fluid at all??
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Old 05-05-2010, 09:11 AM
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Re: Heated Brakes?

I'm a former physics major (never offered the last course I needed to graduate so I switched to math) so I know about heat and friction. That's a nasty pic, the poor 911.

I haven't noticed any brake fluid leaking but then again I'm not the most mechanically inclined. I did have a mechanic look it over before purchase, and it was inspected less than a month ago (out of state purchase and all). The only way I can tell what's going on with the car is that the pedal just gives more than usual. If I push it down 3/4 of the way normally it's 7/8 when it's warm and gets pushed all the way down at the highest temperature it's reached so far. This is all relative since I don't know if it'll go further and I haven't measured it with a ruler or anything. I assumed the brake setup was of stock specs but the dealership I bought the car from two months ago may have thrown some cheap ones on. I guess I'll just run the pads till they go then maybe upgrade the whole system. I thought there was a page on upgrading them to an Acura setup (I thought Vigor but maybe Legend?) but I can't find it. I would upgrade ASAP but it's not like I can sell the pads and make it worthwhile. Running them till they die would be the most cost-effective choice.
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Old 05-05-2010, 10:35 AM
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Re: Heated Brakes?

wow. i know you were only using it as an example, but you should NEVER be able to push the brake pedal down 3/4 of the way!!!! thats not good at all.
the most you should be able to push it down is MAYBE 1/4, which translates into around 2", but again i never took a ruler to it either.


here's a test; with the car/engine cold, and you press the brakes, is it stiff or soft?
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Old 05-05-2010, 06:32 PM
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Re: Heated Brakes?

It sounds like there could be an air leak somewhere.
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Old 05-05-2010, 06:32 PM
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Re: Heated Brakes?

I just got home from work so I'll try to test it tomorrow morning, afternoon, or evening. I'll also get around to checking my brake fluid, I'm busy studying for a final tomorrow so once that's over I'll have the rest of the day free...before I start studying for the next one.
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Old 05-05-2010, 07:02 PM
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Re: Heated Brakes?

Is it intermittent? Mine was and I was having the same issues. I was not going through any brake fluid. It turned out to be the master cylinder in my case. Good luck.
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Old 05-05-2010, 08:19 PM
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Re: Heated Brakes?

I have a similar issue as well. What mine does is;
Every once in awhile, say, if I'm at a stop light holding the brake pedal- I'll notice my leg slooowly extending until the pedal is just about at the floor. If I release the brake and apply pressure again, sometimes it does it again right away where the pedal makes its way back to the floor, sometimes it won't happen again for days or weeks and I have great brake pressure.

If it happens all the time, bleed your brake system.

If it's intermittent, you may need to replace your brake master cylinder.
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Old 05-05-2010, 08:20 PM
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Re: Heated Brakes?

It does seem to be intermittent, I didn't have any problems today until I just took the car out for a short trip tonight, felt as I got home it had gotten to that point. To answer twok's question, it was stiff when the car was cold (the car had been off for two hours, right before that it was a 20 min drive from work).

Edit: Argh linds ya beat me by a damn minute! Yeah, the problem happened rarely but it happened yesterday on the way to work and a few minutes ago.

Last edited by kyosukerob; 05-05-2010 at 08:23 PM.
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Old 05-05-2010, 09:13 PM
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Re: Heated Brakes?

you guys are getting wayyyyy to into this, i bet the fluid sucked in water of theres air in the system, bleed the brakes, its a 5 dollar bottle of fluid, do the cheapest tests first, still soft? check to cracked or rusty lines that look wet,
still soft with no cracks? THEN change the pads and rotors...

also ensure your MC isnt blown...
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Old 05-07-2010, 10:57 AM
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Re: Heated Brakes?

Ugh so the problems is VERY intermittent, it happened a couple times on my way from school to work (exam schedule ftl) but taking my foot off and trying again fixed it (stop and go traffic ftl). I'm going to have my car go in next week anyway so I figure I'll just have them look it at it then, I have too much work to do for finals.
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Old 05-12-2010, 08:34 PM
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Re: Heated Brakes?

So I took the car to the mechanic today (for unrelated reasons) and he said it was most likely the master cylinder... Ugh, already this car has cost me in two or so months what my first car cost in a year and a half.

Forgot to say: I need a cylinder now, and for anyone who didn't know it seems there are different master cylinders for the models. According to this the S had a smaller one and the Si/Vtec models had a larger one. However, all the Ebay pages indicate they vary by whether they have ABS or not, smaller for non-ABS, larger for those with ABS.

Last edited by kyosukerob; 05-12-2010 at 09:40 PM. Reason: I'm stupid
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