Thread: Rear brakes not perfoming

with discs all round and a dual line brake system proportioning should be being handled by the master cylinder.....

hows the rear flex line? and did you clean the preservative off of the rotors before you put the new pads up against them, if you didnt your pads are glazed. a rub back on some wet cement might take the glaze off of the pads.

you might also have some hard pads that are ment to be worked and require some heat in them to function.

Are you short on vacuum? A vacuum leak could be responsible for high pedal pressures, which may be part of the problem. The system is quite possibly designed so that the front brakes lock first, but I am not very familiar with Discoverys.

John

All car braking systems are designed to lock the front brakes first. Don't be surprised if you can't lock the rears, it is a safety feature.

Thanks for replys guys I am stumped, braking is downright woeful, it's like not all brakes are there

Originally Posted by Blknight.aus

with discs all round and a dual line brake system proportioning should be being handled by the master cylinder.....

The only reason I suspected the proportioning valve was from the RAVE CD it stated that the
To maintain the braking balance, pressure to the rear
axle is regulated by a Pressure Reducing Valve (PRV)
This PRV is of the failure bypass type, allowing full
system pressure to the rear axle in the event of a front
circuit failure. It is sited on the left inner wing [fender].

hows the rear flex line? and did you clean the preservative off of the rotors before you put the new pads up against them, if you didnt your pads are glazed. a rub back on some wet cement might take the glaze off of the pads.

Yep gave them a good clean with brake cleaner, flex line looked OK from outside appearance

you might also have some hard pads that are ment to be worked and require some heat in them to function.

Just got back from High Country towing camper, I reckon the pads should be well and truly bedded in by now- tried to not over heat them as you know how the auto prefers going up hill instead of down eevn though I would lock it the lower gears. I installed Bendix 4WD pads, Just thought I would give them a try

Originally Posted by JDNSW

Are you short on vacuum? A vacuum leak could be responsible for high pedal pressures, which may be part of the problem. The system is quite possibly designed so that the front brakes lock first, but I am not very familiar with Discoverys.

John

I went through an old post of Blknights when he went through testing the vacuum system and it did all the things it should have, so I assume all is OK there- although I am bothered that the pedal does feel hard to push like the vacuum may not be 100%.