924Board.org

[badenkb]

HI All

I'm stilling having problems with my 924 na brakes (77 model)....help!
I've bled them twice and still the pedal pushes to the floor.
To recap - I have new brake lines and hoses all round, rear brakes rebuilt and front calipers a mix of reconditioned and new old stock. They bled fine - am I missing something with 924 brakes?

Any advice please!

Thanks

Ian

[jamez]

master cylinder?

[marky522]

If you want to try replacing the master cylender i have one out of a 81 924 na let me know.

Mark

[awilson40]

Yep... you have some blown seals in the master cyl.

[badenkb]

HI All

Update to previous comments - I've removed the cyclinder and servo this morning. When I disconnected the master cylinder form the servo, there was a hissing sound of escaping air again.
If I could try your spare master cylinder Mark - that would be great and if its the problem would it be for sale???

Thanks again for all the input - this is the last major problem prior to getting the car back on the road after 2 years...

Cheers

Ian

[Diesel]

The master cylinders are different from 77-81. Different part numbers.

[marky522]

If you would like to try i can send it your way tomorrow. Shipping wouldent be much cause i work at staples and get a ok discount. let me know. if it matters there are three out-lets for brake lines, one on each side and one on top on the very front of the unit.

Mark

[badenkb]

HI

Thanks for the reply mark.
Hmm. the master cylinder I have also has three outlets : 2 on the LHS (when stood facing the windscreen) and one on the RHS. It is the model with pressure switches on (although I am happy to lose those - I know there was a changeover to an internal brake pedal switch about 81). I don;t appear to have any outlet coming from the front of the cylinder though ?
If this still sounds suitable, I am at :
67 Hatterboard Drive, Scarborough, N Yorks, yo12 6ng
If the part is a complete mismatch, I'll repost it back to you.

Many thanks again
Ian

[Diesel]

Close enough is good enough, right?

[Rick MacLaren]

There's a distinct ORDER you have to follow while bleeding the brakes...

Also, water in the brake lines accumulates...it'll also cause the symptoms you're describing...

_________________
1980 Porsche 931 Bitched.
1979 Porsche 924 Tweaked.

[ This Message was edited by: Rick MacLaren on 2001-12-04 04:40 ]

[badenkb]

HI All,

I presume the order of bleeding brakes is to start from the furthest from the master cylinder to the nearest (which on a RHD car is the back right, back left, front right, front left). I did this twice and had the same problem in both instances - zero pedal resistance.I don't think its water either in the brake lines as they are all new and new fluid.I intend to strip the offending cylinder down this weekend to check for damaged seals anyway.

Thanks

Ian