924Board.org

[924er]

im restoring my car been sitting for 3 years
rebuilt head got everthing in the engine is running great but after i installed the brakes there was no pressure on the pedal at all, i check everything is installed correctly but im pretty sure its the master cyliner, only the metal pipe lookin piece is faulty(dont know name). im a poor student and i need a cheap part, the junkyard is charging outrageous number so i looked everywhere online and the cheapest i found was $122, not bad but anyone know a good cheap site for that kind of part>?

thanks

http://www.rockauto.com/catalog/raframecatalog.php?carcode=1263259&parttype=1836&a=FRc1263259k259759
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80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

[Mike924]

I could tell you're a student from your impeccable command of grammar and punctuation!

Firstly, why are you so sure that it's the master cylinder? Have you taken it off the car and checked it? Do you know if it will respond to a rebuild?

Just don't want you to spend precious time and money fixing the wrong thing...
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[gohim]

Try disconnecting the brake hoses where they screw into the calipers or the wheel cylinders one by one and use a hand-held vaccum pump (MityVac) to draw the fluid from the brake master cylinder down to the brake line you are attached to.

You didn't say why you had the master cylinder out of the car or dry, but when you allow the master cylinder to go dry, or install a dry new master cylinder, you need to draw fluid into the master cylinder, and down into the brake lines running to the wheels before the master cylinder will be able to pump fluid.

You can borrow a vaccum pump for free (free tool loan) from most of the chain auto parts stores.

If you are trying to bleed/pump fluid to all the brake lines, and you have been using the old fashion pumping on the brake pedal method, you should know that you aren't going to get anywhere until you adjust the rear shoe clearance.

It is easier to bleed the brakes (or even get fluid to pass) when you have worn brake pads or brakes shoes installed, because there is more room in the brake calipers or wheel cylinders for the fluid to pass through, than when you already installed new pads and shoes, and there is very little space inside of the calipers and wheel cylinders for brake fluid.

This is why I suggested disconnecting the brake lines from the calipers and wheel cylinders initally to get the fluid flowing. You will need to reconnect the brake lines, and rebleed to remove air, but that's a snap when you have good flow.

[924er]

yea well the kit inside the master cylinder is broken, so i removed it and i will drain the brakes when i get me new part...
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80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

[gohim]

If I were you, I would buy a new master cylinder, it sounds like you are fairly inexperienced at cat repair, and a mistake inside of the master cylinder will be lethal.

Do yourself a favor and get a new 81-82 master cylinder which is similar to yours, but less expensive, because the the brake stoplight switch is removed from the master cylinder. The stoplight switch is replaced with an inexpensive switch mounted on the brake pedal (the hole is already there). The wires for the stoplight that attach to the master cylinder are simply pulled back inside the car where they came from, and plugged into the new switch on the brake pedal.

A simple plug and play improvement.

[924er]

yea im not a experienced in cars, but dont worry my neighboor is the one working on it he has worked on many cars before and is doing the work for me but he dont speak good english so im just getting second advice from this site..

he checked that the master cylinder needs to be changed...
im aware of what happens when you remove it...
an 81-82 master cylinder? i didnt find any thing cheaper then 300 im just gonna place an order on the 122
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80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

[gohim]

I found brand new ATE (OEM) master cylinders for $248 including free shipping at stopshopanddrive.com.

Make sure that the Cardone part the you would be getting for $122 is the right one for your 1980 car. If it were actually the 1981-1982 part you would be okay, but if it's the 1979 and earlier part, it won't work.

[924er]

yup i double checked and its for 1980 924, it should be arriving here next thursday

thanks for ur help ill let you know what happened
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80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy