Inop rear brakes
Hi guys
Ive done the front brakes on the silver 89 car, have moved to the rear. Just busy with the n/side first - i've replaced the wheel cylinder due to a snapped bleed valve, also all the springs (in a nice little repair pack from mb). I have bled it off, adjusted up the shoes, yet i can get virtually no braking at the drum, just a slight resistance, in addition the pedal is very hard. As i said, i managed to bleed it, so fluid appears to be flowing, although i will say it wouldnt freeflow with the bleed nipple open, only under pedal pressure..........
Has anyone got a clue whats going on????
Please??????
Cheers guys
Is it the brake load arm on the axle ?
If it is not set up correctly it cuts off the rear brakes .
Twodogs
Hello Jonnyboy,
If the brake pedal is firm, and you are not getting full braking force on the drum brakes the problem lies with the brake force limiter valve.
Before I delve deeper into the topic, ensure the axle stands are mounted under the rear diff. and not under the chassis frame. The b/limiter valve needs to have the vehicle weight on it, test the brake drum force, it should lock up with the brake pedal depressed. If not, you do have a problem.
On that firm brake pedal, I take it, that it is always firm at every application. If it is soft at the very first application of the day or after 10 minutes or so, between pedal applications, then you still have an air lock which should be bled out.
To test out the b/limiter valve, disconnect the bottom ball joint of the connecting rod on the limiter valve and the axle. Moving the rod lower down, simulates additional weight to the vehicle, reducing the limiting effect on the brakes. With the rod pulled down and depressing the brake pedal again, you should experence more braking force on the drum.
Moving the rod higher up will increase the limiting effect on the brake force, whereby, depressing the b/pedal will show a limited effect on the brake force on the drum. If these results are not achieved, the limiter valve is faulty.
To adjust this rod, you will need further instructions. Call back, and I can instruct further.
Regards,
Presume you adjusted the shoes correctly... does the handbrake work? Could be that the manual adjusters are not far enough out but normally you would have popped the brake cylinders out by now and there would be a dribble of brake fluid and a very sinking pedal feel... if the hand brake works then you know it hydraulic failure so focus on making them work first .. surprised if the load limiter stopped the brakes working.. it just reduces the braking effort/pressure after a certain spring load .. not normally stopping all pressure getting back to the rear brakes.
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Guys, you may have solved my problem with the compensator valve thing, i'l re-position the axle stands and report back.
Cheers