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Author Topic:   brakes, brakes
leftturn73
Dirt Maniac

Total posts: 199
posted July 05, 2005 09:06 AM  
Need some input,I am having a issue with my brakes. I run the big GM calipers All new with best Performance friction pads. Loading or on a caution I have good brakes (firm peddel) after up to speed and 1 to 2 laps I have to pump usually once to get the same good pedal feel back. Once back on a caution the pedal is firm again. Only thing I can think is a warped rotor causing the caliper piston to move in thus the needed pump. Any thoughts??

leapinlizard
Dirt Freak

Total posts: 402
posted July 05, 2005 09:31 AM  
Warped rotor might cause a extra pump but you sure would feel the wobble. It would also happen all the time. You might be boiling the fluid or still have air in the system.

wfoondirt
Dirt Forum Champ
Total posts: 505
posted July 05, 2005 09:43 AM  
As stated, I'd check for pad kickback first and bleed the brakes to insure you have good fluid.

leftturn73
Dirt Maniac

Total posts: 199
posted July 05, 2005 11:08 AM  
I would agree I should feel a wobble and do not. The only brake line that comes close to heat (header) I have sheilded. I will attempt to bleed the brakes again but have done so a couple times. I gravity bled for 1/2 then pressure bled. ??????

Anyone else have any thoughts

msnead
Dirt Forum Racer

Total posts: 77
posted July 05, 2005 11:08 AM  
We had 2 problems both with the same symptoms that you are describing on our 4-bar car.

Problem #1: When the car was up on the bars, the steel-braided brake line on the LR wasn't quite long enough and would "pull" the caliper away from the disk meaning that the driver would have to pump the brakes once or twice to get the pads close to the disk again.

Problem #2: We found this one last week... The top LR bar would hit the caliper (we know this because it crushed the bleeder). When it hit, it would cause the same problem--the caliper would back away from the disk. It would take pumping the brakes once or twice to get the pads close to the disk again.

To fix problem #1, we lengthened the brake line. To fix problem #2, we moved the location of where the bar mounted on the bird cage so it wouldn't hit anymore.

This past week we didn't have any problems with brakes.

Good luck,

m

nyimcamod8t
Dirt Full Roller

Total posts: 67
posted July 05, 2005 06:12 PM  
hmmm,i'm wondering if i have that same problem with the LR.I've noticed a few times when the car was all wadded way up in the air the pedal would be soft when i got on the binders heading in the corner.may have to look into that somemore. thanks msnead.


leftturn73
Dirt Maniac

Total posts: 199
posted July 06, 2005 07:51 AM  

Great feedback I will check my calipers.

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