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Author Topic:   brakes locked up
race it
Dirt Full Roller

Total posts: 36
posted June 01, 2003 09:13 PM  
had a good run going this weekend. track was slick, used alot of brakes, next thing i know brakes lock up. enter the corner got on the brakes the same as i had first 8 laps, started back on gas and it was like the front tires were glued to the track and the rear came on around. not good in front of 22 cars. when i got in the pits we jacked the front of the car and couldn't hardly turn the tires over by hand. anyone know where to start looking?

[This message has been edited by race it (edited June 01, 2003).]

racer17j
Dirt Forum Champ
Total posts: 5390
posted June 01, 2003 09:18 PM  
The first thing I would try is brake the bleeders loose and see if you still have fluid pressure at the calipers (with out pushing on the pedal) if you do I will tell you where to go from there....Towman

Tim Weiss
Dirt Forum Racer

Total posts: 88
posted June 01, 2003 10:44 PM  
If you are running the stock rubber lines they may be stopped up

race it
Dirt Full Roller

Total posts: 36
posted June 04, 2003 09:34 PM  
thanks for the help, think we found the problem. was running dot3 and got it to hot and it built presure. dot3 has boiling point of around 250F. switched to dot5 has boiling point of 550F. something for everyone to think about, because I didnt know

c21
Dirt Forum Champ
Total posts: 521
posted June 05, 2003 10:16 AM  
quote:
Originally posted by race it:
thanks for the help, think we found the problem. was running dot3 and got it to hot and it built presure. dot3 has boiling point of around 250F. switched to dot5 has boiling point of 550F. something for everyone to think about, because I didnt know


haven't found boiling fluid causing brakes to lock up ..... just fade.

something I have encountered is the brakes locking up when they get hot because there is no play in the pedal .... due to an excessively long master cylinder pushrod (or pushrods in a dual set-up).

as things heat up they expand .... you need a little free play in your brake pedal to compinsate for this.

Check your pedal play, if you have little or none, try scrooing in or shortening the pushod(s).

c21



race it
Dirt Full Roller

Total posts: 36
posted June 05, 2003 09:15 PM  
thanks i'll look at that

jhon hollomon
Dirt Freak

Total posts: 468
posted June 05, 2003 09:48 PM  
I changed the front end in my old chevy truck from drums to disc. I also changed the master cylinder and had a push rod that was too long. The more I drove it and used the brakes the more they would drag until I got out and cracked the bleeder to release them. The longer push rod was building pressure and not releasing all the way. Don't know if that helps but it's something to think about.

driver27
Dirt Maniac

Total posts: 194
posted June 06, 2003 07:00 AM  
c21 has hit the nail on the head. Too long a brake rod doesnt allow the piston to fully return and bleed off all the fluid back to the master. Put a tad of extra play in the rod and your problem will be fixed.

race it
Dirt Full Roller

Total posts: 36
posted June 06, 2003 09:05 PM  
thanks guys, it sounds like it might be the problem, when i made the rod i didnt make it with play, didnt want it to fall out. i will check it, thanks again. will know more after sat night. good luck to everyone this weekend.

ARMallardSlayer
Dirt Maniac

Total posts: 175
posted July 05, 2005 10:34 AM  
I hope this is the problem with my son camaro....we are killing ourselves trying to figure out why the calipers keep locking up..........this sounds like it may be the problem....everything is new, so I don't think it's a hose collasping or coming apart.

Gonna check it our and get back with ya.

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If you can't work em in close & git em in your face with their orange landing gear down, don't bother taking the safety off......

ARMallardSlayer
Dirt Maniac

Total posts: 175
posted July 05, 2005 03:39 PM  
That's exactly what was wrong with his brakes, there was no play whatsoever and the slightest bump of the pedal was steadily building pressure........

Thanks Guys!

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If you can't work em in close & git em in your face with their orange landing gear down, don't bother taking the safety off......

    

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