924Board.org

[jamez]

I'm doing the 4 wheel disk brake conversion... is it absolutely necesary to put in a 944 master cylinder? cuz if i just use the m/c thats on my car right now it will save me alot of time and money.. I will eventually get the 944 m/c obviously but as a poor college student I have to do one project at a time... so what do you guys think?

-Jamez

[Smoothie]

Which car and model year do you have?

[Peter_in_AU]

1. Look at the FAQ
2. Use the search

It's all been asked, discussed and answered many times before.

[924RACR]

Second all of what Peter said, with specifics - if you don't use the right MC, you can run out of pedal travel - meaning you have insufficient braking. Underbraked car = lawsuit and bent fenders. Don't do it - brakes are the last place you should cheap out! If you can't afford to do it, don't!

I'm a brake engineer - any questions?

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

[Smoothie]

The Technical Specs booklet says that from mod 80-on, 924s have the larger 23.81mm master cyl. with a stroke of 17-15mm vs 20.64mm/stroke 16-14mm on pre mod 80. The brake booster is also 9" from mod 80 (vs 7" pre 80). 5 bolt 924 and 924 turbos and M-471 option use 23.81mm master cylinders (17-15mm stroke) and 9" boosters. It would seem that if you have a mod 80 or later 924, you already have a larger master cylinder, but; I don't know if "944 brakes" take an even larger one and I also don't know why I'm spending so much time on this. If you're poor enough to do a disk brake conversion, you're poor enough to go for a rebuilt master cylinder. So there. Goodnight. Do your homework.

[Peter_in_AU]

Vaughan,

the FAQ is looking great! I haven't been there for quite a while and I'm impressed.

Well done.

[jamez]

Thanks for the info guys, I guess i better not f*** around with my brakes, damn my car is nickle and diming me to death, and nothing has even gone wrong with it yet

-Jamez