Trying to replace the brake Master

Tiny
GDOAKS
  • MEMBER
  • 2005 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 40,000 MILES
Trying to replace the brake master and the retaining bolt removed but the brake master won't budge.
Friday, July 3rd, 2009 AT 9:40 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

There are two bolts that hold the brake master cylinder to the brake booster. Take a look through this link. It shows how in general one is replaced. You can use this as a guide. It also explains bench bleeding a new master cylinder which will need done.

Here are the master cylinder installation instruction you have requested. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://youtu.be/WDxvEQrMkBg

and

https://youtu.be/w7gUsj2us0U

and

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Here are the directions specific to your vehicle. The pics below correlate with the directions.

Caution: Refer to Brake Fluid Irritant Caution in Service Precautions.

Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Service Precautions.

1. Disconnect the electrical connector from the brake fluid level sensor.
2. Disconnect the brake pipes from the master cylinder.

3. Important: Install a rubber cap or plug to the exposed brake pipe fitting ends in order to prevent brake fluid loss and contamination.

Plug the open brake pipe ends.
4. Remove master cylinder mounting nuts.
5. Remove the master cylinder from the vehicle.
6. Drain the master cylinder reservoir of all brake fluid.

Installation Procedure

1. Bench bleed the master cylinder.
2. Install the master cylinder to the vacuum brake booster.

3. Notice: Refer to Fastener Notice in Service Precautions.

Install the master cylinder mounting nuts.
Tighten the master cylinder mounting nuts to 33 Nm (24 ft. lbs.).
4. Remove the plugs from the brake pipes
5. Connect the brake pipes to the master cylinder.
With ABS tighten the brake pipe fittings at the master cylinder to 30 Nm (22 ft. lbs.).
Without ABS tighten the front brake fittings to 27 Nm (20 ft. lbs.).
Without ABS tighten the rear brake fittings to 25 Nm (18 ft. lbs.).
6. Connect the electrical connector to the brake fluid level sensor.
7. Bleed the brake system.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Wednesday, March 10th, 2021 AT 8:38 PM

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