Brake help

['80_928]

just bought an '80 928. its been sitting for a long time but motor and trans is great. all the reservoirs are bone dry and and fuel pump is about to be replaced. i put brake fluid in the reservoirs and the clutch works properly, but the brake don't budge.

i need help. please reply.

thanks

[redrider044]

Bleed the brakes first. If you get a firm pedal, the fault lies with the calipers. If you can't get a firm pedal, the master cylinder is bad, there is a leak in the lines some where or it's one or more of the calipers leaking. If it's any of the calipers, rebuild or replace them in pairs. If you rebuild or replace the calipers, make sure you install them with the bleeder screw pointing up, twards, the hood. If you install a caliper with the bleeder screw pointing down, you will never get a pedal because you can never get the air pocket out. There are right side & left side calipers.

[lizard928s]

If the car has been sitting a long time then it would be a good idea to disassemble the brake colipers, then clean and reassemble with fresh seals.

On an 80 the seal kits are DIRT cheap, and it is very easy to do.

[rhjames]

redrider offers good advice of which I will add this:


I have found that once you start replacing/repairing "anything hydraulic".....you may as well replace the entire system. if one cylinder is bad, chances are the others are not far behind it. this would include the brake master cylinder, clutch master cylinder, clutch slave cylinder, the infamous blue hose, the rubber clutch hose, the flexible wheelend brake hoses, and the brake wheel cylinders (rebuild the calipers--surprisingly, the piston seals may not need to be replaced, but be prepared to do so). make sure the calipers are moving freely, not stuck or froze up.

when bleeding the system, start with the right rear brake, then move to the left rear brake, the right front, then left front. then bleed the clutch system.....the clutch system can be bled with a "Motive power bleeder", but you must pump the clutch pedal while the power bleeder has pressure on the system. speed bleeders help---power bleeder is also a big help. be sure to use a good brake fluid---the super blue racing fluid is a good choice, available from PP or any of the major 928 suppliers....one can will do the entire system. do not re-use any fluid that has been run through the system.


if yours is/was like mine (when I got it), you'll find 1980 fluid in it, which when bled, will come out looking like mud. truly scary stuff.....


good luck----





--Russ