Guys - Help me out here..... I have a pile of Brake booster/Master units. In that pile there is 1 unit for a rear disk car, all the rest are from rear drum cars.

How do I know which one is the rear disk unit ????

 

John,any way to let me know any part#s? Then I can probably help u.

 

Let me take a look an see if I cna find any type of numbers on one of them........


John in RI
Berlinetta@prodigy.net

 

A J50 master cylinder = disc/drum.

A J65 master cylinder = 4-wheel-disc.

The boosters are the same. Er, well, at least, as far as anyone's ever known.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

John,The 4 wheel disc brake master cyl has a 1" piston.

 

That's good to know.

Now I need to know what size the piston is in the manual master cylinder that I found on an S-10. It's already installed. 1" or larger would be nice.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

Thanx a ton fot the help guys ! I looked at one of them quick but didn't see anything at a quick glance. I know there are numbers on the bottom of the Master cylinder and a sticker on the M/C & the Booster..... I'll look a bit more carefully once I get home.

Thanx again !

 

That's true; piston size. J50 (disc/drum) is 24mm, 1.4mm smaller than the 4-wheel-disc one. Side by side that's not too bad to measure- you can see the housing around the piston is a bit thicker on the J50 with the smaller piston. Not much, just a bit.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!