I just came across this today, and thought it might shed some light on the reasons for the various M/C sizes for those swapping disc and drum rears, or doing the 1LE conversion:

Number: 84-88

Section: 5 (V)

Date: Mar., 1984
Subject: REDUCING BRAKE PEDAL EFFORT ON CAMAROS WITH FOUR WHEEL DISC BRAKES

Model and Year: ALL 1982-84 CAMAROS
TO: ALL CHEVROLET DEALERS


The higher brake pedal effort associated with 1982-84 Camaro cars equipped with four wheel disc brakes may be a source of some customer comments. The J65 brake system was designed with a low pedal ratio for reduced free travel and a firmer and higher effort pedal for the high performance buyer. Owners of J65 equipped Camaro cars not sharing this interest and desiring reduced brake pedal effort can be accommodated by replacing the original production master cylinder assembly with the appropriate J50 master cylinder unit specified below.

<TABLE BORDER=1><TR><TD>MODEL YEAR</TD><TD>ORIGINAL J65 MASTER CYLINDER</TD><TD>REPLACEMENT J50 MASTER CYLINDER</TD></TR><TR><TD>1982-83</TD><TD>18009370</TD><TD>18009367</TD><TR><TD>1984</TD><TD>18010574</TD><TD>18010572</TD></TABLE>

 

Is their some way to put this also in the 1LE thread that asks about the master cylinder? It sure would save me getting a lot of emails at home.
Thanx for the new info.

 

WOW! So GM actually says you can use either master cylinder, eh? Cool. A few guys stuck with their original J50 disc/drum master cylinder and had no problems... mystery solved, eh?

Thanks!!


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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!

 

I was looking through a Bendix catalog. GM also uses a different brake booster for each master cylinder.

 

Details please!