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924 Brakes - Master Cylinder?

 
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stan_5150  



Joined: 01 Sep 2006
Posts: 3
Location: Minnesota

PostPosted: Mon Jul 13, 2020 7:51 am    Post subject: 924 Brakes - Master Cylinder? Reply with quote

Good day. 1978 924 approximately 76K on it. Last time it had tabs on it was in 2002 and to my knowledge it hasn't been run since then. It was my dads and he always garaged it. Any.....

Brake pedal went to the floor, noticed that there wasn't any brake fluid in the system so I've spent my time bleeding all 4 corners. Fluid pumps, no air that I can tell, but pedal still goes to the floor. I'm thinking master cylinder but if anyone has any suggestions please let this noob know!

Thanks.
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1999
Location: MI

PostPosted: Mon Jul 13, 2020 10:34 am    Post subject: Reply with quote

Sounds right..
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stan_5150  



Joined: 01 Sep 2006
Posts: 3
Location: Minnesota

PostPosted: Tue Jul 21, 2020 4:48 am    Post subject: Reply with quote

Much appreciated! Anyone have a good suggestion for a parts source for a Master Brake cylinder for these? I've seen everything from a $75 rebuilt unit to $750 for a new one. Any/all suggestions welcome. Thanks again.
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Paul  



Joined: 02 Nov 2002
Posts: 9439
Location: Southeast Wisconsin

PostPosted: Wed Jul 22, 2020 12:21 am    Post subject: Reply with quote

Thanks for saving another 924. I've had good luck with rebuilt hydraulic parts.

Brake hoses have a 10 year life, if they are older, you should replace them.

https://www.oreillyauto.com/shop/b/brake-systems-16456/brake-hydraulics-16513/brake-hose-12844/b5f009f547f7/1978/porsche/924?q=brake+hose&fitAttr_10039=Show%20All

https://www.fcpeuro.com/Porsche-parts/924/?year=1978&m=20&e=802&t=6&b=9&d=&v=10&keywords=brake%20hose
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stan_5150  



Joined: 01 Sep 2006
Posts: 3
Location: Minnesota

PostPosted: Wed Jul 22, 2020 1:16 am    Post subject: Reply with quote

Great suggestions! Time to do some shopping and fixing.
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scm924s  



Joined: 22 Oct 2010
Posts: 228
Location: Gloucester UK

PostPosted: Wed Jul 22, 2020 6:37 am    Post subject: Reply with quote

There was a change to the master cylinder about 78/9, the later ones were larger, also did away with the 2 brake light /fluid level warning light switches on the bottom of the m/cyl. At least on the euro spec cars. Early ones appear to be getting harder to find.
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!tom  



Joined: 28 Aug 2006
Posts: 1902
Location: Victoria, BC Canada

PostPosted: Fri Jul 24, 2020 3:36 am    Post subject: Reply with quote

The 78 still used pressure switches...
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