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  #1  
Old 09-20-2013, 08:05 PM
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Brake issues while at the track

Alright this may be a stupid question but, I've been auto crossing more lately and sometimes when i go to hit the brakes the pedal is impossible to push down. After a few seconds the pedal finally give in and actually goes down.

I bought new brake fluid which should be here sometime next week. Do you think that will solve that issue?
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Old 09-20-2013, 11:34 PM
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Re: Brake issues while at the track

could be/..but probably need new rotors and pads for racing
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  #3  
Old 09-21-2013, 05:13 AM
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The rotors are only a few months old same as the pads. I did some more reading online and it sounds like loss of vacuum assist.
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Old 09-21-2013, 06:17 AM
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Re: Brake issues while at the track

The brake fluid should not cause this kind of problems. When using the brakes a lot, the brake fluid could start boiling and cause air bubbles in the fluid, which would make the brake pedal feel spongy.
Loss of vacuum assist will make the brake pedal hard to move, so could be your problem.
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Old 09-21-2013, 07:42 AM
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Yea I'm thinking that's my issue. Any clue how to fix it?
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Old 09-21-2013, 07:52 AM
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Re: Brake issues while at the track

Does it only happen when at the track, or did it happen with normal driving as well? If it is vacuum related, why would it only happen at the track?
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Old 09-21-2013, 08:00 AM
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It's only at the track. I'm assuming its from braking hard then going WOT right away so the pressure never has time to depressurize with all the air rushing through the motor at WOT
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Old 09-30-2013, 03:05 PM
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Re: Brake issues while at the track

I see this in my jeep but it's when I go to start it sometimes the pedal is solid but after it starts it is normal again. Would be scary if this happened in motion. The dealer should be able to test for vacuumed leak.
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Old 09-30-2013, 06:30 PM
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Haven't brought it to the dealer yet. I actually tried this past weekend to replicate it but couldn't. I'm going back to the track in late October so I guess I'll see then. I'm putting in some wilwood 600 EXP brake fluid. But I doubt that will solve the problem.
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Old 10-30-2013, 02:59 PM
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Re: Brake issues while at the track

I just noticed my post didn't post. Sometimes when starting mine the brake pedal is rigid but it goes away after engine starts. It would be scarry to have it do that while moving.
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Old 10-30-2013, 03:30 PM
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Re: Brake issues while at the track

Quote:
Originally Posted by radbushi View Post
I just noticed my post didn't post. Sometimes when starting mine the brake pedal is rigid but it goes away after engine starts. It would be scarry to have it do that while moving.

This is normal behaviour after the jeep is off for a longer time. The vacuum will sip away and the vacuum assist is gone, making the pedal very hard to move. Once the engine is started, the vacuum is regained and the assist is back and the pedal feels as normal.
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