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Author Topic:   Strange brake problem
chickenlittle
Dirt Full Roller

Total posts: 63
posted August 21, 2005 12:00 PM  
Here a weird one for you. Had spongy peddle going into turn 3 but worked fine in turn 1. Did this almost every lap. We had a red flag for a flip and peddle was firm for about 2 laps. Then right back to the spongy deal in turn 3? Don't understand why it worked in 1 and not 3? Any ideas?

Fastride 38
Dirt Maniac

Total posts: 125
posted August 21, 2005 07:16 PM  
Maybe...and this is just a maybe. There is some air in the lines and you were hitting the brakes alittle harder in one corner.

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Drdirt
Dirt Roller

Total posts: 11
posted August 21, 2005 08:12 PM  
Check for a bent brake caliper bracket.Could be causing the caliper to hang up or stick occasionally causing erratic brake pedal.

deasley
Dirt Full Roller

Total posts: 54
posted August 22, 2005 03:35 AM  
WE HAD THE SAME PROBLEM ON OUR CAR LAST WEEK AND AFTER ALOT OF LOOKING I FOUND A CRACKED LINE ON THE BIAS GAUGE AND IT WAS CAUSING AIR IN THE LINE. ONLY WAY WE FOUND IT WAS TO PUT THE DRIVER IN THE CAR AND HAVE HIM HOLD THE PEDAL DOWN UNTIL IT STARTED TO FADE. WE REPLACED THE LINE AND IT IS FINE NOW.
HOPE THIS HELPS YA OUT.

D.EASLEY

msnead
Dirt Forum Racer

Total posts: 77
posted August 23, 2005 07:19 AM  
I've said this before in other posts...

We had 2 problems on our 4-bar car that caused the same symptoms:

1. The bottom bar was hitting the caliper and crushing the bleeder which was causing the pads to push away from the rotor when the car was up on the bars.

2. The brake line on the left-rear was too short and every time the car rocked over hard in the turns, it would "pull" on the caliper causing the pads to pull away from the rotor.

In both cases, the driver would have to pump the brakes once before he had any pedal.

If your brake lines attach to the frame instead of following the rear end, I would check to see if they are too short. If the car rocks over harder in one turn than the other (like on an egg-shaped track), then it could be the brake line deal.

In our case, the brake line was steel-braided...I doubt this would happen with a nylon line...it would just break.)

Just some more things to check...

m

LATE MODEL 9W
Dirt Full Roller

Total posts: 66
posted August 28, 2005 08:05 PM  
Bad brake fluid?

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