Brake Master Cylinder

Info

7/8" bore

Replacing a Master Cylinder on North American Cars

There are major differences between the North American (NA) and the Rest of the World master cylinder. The NA version has three (3) pipes, other have four (4) pipes. The remainder of this portion will deal with the NA version.

It is difficult to remove the master cylinder due to stuff in the way. I am writing this after just completing the removal. The first few steps are to gain access to the master cylinder.

1. Drain the radiator – on NA cars there is a drain on the lower left. Don't forget to tighten this back up. Be careful when tightening this piece it is plastic and it is a Lotus only part.
2. Remove the overflow bottle
3. Remove the overflow bottle retain bracket. Don't worry the nuts for the 3 small bolts are an integral part of the frame and won't move or fall out.
4. Remove the inlet pipe that goes between the intake manifold and the inter-cooler.

Now the real fun starts.

1. Remove as much of the brake fluid as you can.
2. Unplug the low brake fluid sensor from the harness
3. Pry off the black plastic cap. Be careful it pops right off. I still haven't found mine.
4. Pull the guts of the sensor straight up. Only the black plastic cap holds in on so this is easy.

Cross reference

Make Model Year Application

PONTIAC Asuna (Canada) 1990-1991 4-1.6L F/inj. (6)

PONTIAC Asuna (Canada) 1989-1990 4-2.0L F/inj. (K) w/ Power Brakes Stamped 2631

PONTIAC Lemans-FWD 1990-1993 4-1.6L F/inj. (6)

PONTIAC Lemans-FWD 1989-1990 4-2.0L F/inj. (K) w/ Power Brakes Stamped 2631

PONTIAC Optima 1990-1993 4-1.6L F/inj. (6)

PONTIAC Optima 1989-1990 4-2.0L F/inj. (K) w/ Power Brakes Stamped 2631

Possible US sources

AC-DELCO 174-812

AC-DELCO 18M478

AC-DELCO 18M555

AUTOSPECIALTY M-13002

BECK/ARNLEY 072-8751

CARQUEST E150607

CENTRIC 130.36002

EIS E150607

GENERAL MOTORS 3492362

ITM 25-01609

LUCAS GIRLING 211526

NAPA (BRAKE) 39869

RAYBESTOS MC-39869

From GLS Autoparts

Possible UK sources

Unipart Brake Master Cylinder:

Product Code: BUYOUT0014957

Description: FPSPMH392 MASTER C

Price incl VAT: 110.09 GBP (2007 price)

LEC discussion