924Board.org

fredrikl · Guest

Hello,

My car has the kind of self-adjusting rear drum brakes that are described in the supplement chapter of the Haynes manual.

I am wondering if there is any way to adjust these brakes or make them work more efficiently. They are working, but don't have enough grip, which causes the front wheels to lock and slide since they are doing all the job.

best wishes,
Fredrik

Diesel · Guest

If you adjust them initially by hand and you aren't getting the right performance from the brakes(at least for some miles until they are out of adjustment again), you are looking at a different problem. Your brake balance is affected by many factors like glazed drums and linings, crimped metal lines, check-valving brake hoses, air in the system, siezed parts....I could go on and on, but I won't! Time for some detective work!

924RACR · Posted: Thu Nov 01, 2001 6:21 am Post subject:

Correction: your rear brakes should never (and never will) lock before the front. If they do, your proportioning is bad. The 924 has no prop valve, so it's strictly a function of the sizing of the base brake hydraulic system.

Not to say there are no problems with your brakes, but your assumptions are incorrect.

_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Vince Ponz · Guest

1. lower car height in the rear, car should be level
2. Portioning valve for brakes
3. check the thickness of the drum
4. check brakes for leaks on pads
5. don't forget to check thickness of front rotors
6. tire inflation for me is the same on all four tires and the car stops straight. I have done all of the above. Stops great.

HRK · Guest

After checking everything is working properly and there is no wearing leaks or glazing and you still want more braking on back tyres, you should look for VW Transporter brake cylinders. There are diameter 21, 23 and 25 cylinder available for Transporter.
Original diameter of Cylinder is about 19 mm and you can easily fit 23 mm cylinder in there. The main fitting hole is the same for cylinder but you have to grind the small fixing bolt hole a few mm oval. Not a big job. Great for Autocross!