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Jerky Brakes


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I have a problem with my 98 CH613 with real jerky brakes. Very little foot pressure makes them grab and almost throw me through the windshield. Even when I'm inching up at a traffic light when I touch the pedal lightly they grab.

I run a 23 foot dump and a 52 foot drop deck. It does it with both trailers but not as bad with the 52 footer on.

I had the brake pedal valve tested (it was bad) and rebuilt. No change. I had also changed the springbrake control/relay valve near the rear drives. No change. All brake positions are in adjustment.

Any ideas?

Thanks

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I have a problem with my 98 CH613 with real jerky brakes. Very little foot pressure makes them grab and almost throw me through the windshield. Even when I'm inching up at a traffic light when I touch the pedal lightly they grab.

I run a 23 foot dump and a 52 foot drop deck. It does it with both trailers but not as bad with the 52 footer on.

I had the brake pedal valve tested (it was bad) and rebuilt. No change. I had also changed the springbrake control/relay valve near the rear drives. No change. All brake positions are in adjustment.

Any ideas?

Thanks

Does it only happen when the trailers are hooked up?

Ed Smith

1957 B85F 1242 "The General Ike"

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I was actually going to vote for the relay valve being bad, I've fixed this issue with one before. Do you have an application pressure gauge on the dash? If not get some fittings and a cheap air pressure gauge that goes to 120psi and plumb it into the activation line to the relay valve(one from the treddle). When applying foot pressure to the treddle you should be able to watch the guage and gradually build pressure from 0 up to about 90psi. If the gauge jumps up as soon as it starts to move the treddle is bad, if the treddle applys gradual easy to control pressure its the relay valve.

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the spring brake control relay valve wont help. you need to change the application relay control valve . and one wont interchange with the other because the application relay has a lower cracking pressure. if you put a spring brake relay in place of the application relay you will have very abrupt brakes because their cracking pressure is much higher.

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One thing that I have to remember to do is pull the pin on the brake pedal to remove it and make sure the roller is clean, moves freely and is lubricated every so often. It is hiding in plain site.

Not saying it is causing your problem but more of a maintenance item for good operation over the long haul.

Jim

It doesn't cost anything to pay attention.

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chase the air lines from the service port of the brake chambers [line closes to the slack adjuster] upward the first valve you hit will be the quick release valve the next valve you come to should be the application relay valve. should be frame mounted and close to the drive axles

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