Question about 1993 Pontiac Bonneville

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I need to replace the brake master cylinder, how do I do it?

What do I need to do to replace the master cylinder on my 93 Bonneville?

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Remove nuts from vac. booster remove brake lines reassemble on vac booster conect lines snugly fill with fluid thenbleed lines and tighten should work

Posted on Jul 14, 2008


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How to Install Master cylinder in 2001 Bonneville?

The new master cylinder should have bench bleeding instructions provided in the box with it, it should come with some plastic fittings that screw into the holes that the lines attach into and some plastic tubing. You screw the fitting into the holes and attach the tubing to the fittings. Clamp the master cylinder in a vise and fill the reservoir with fluid, put the tubing into the reservoir and actuate the plunger until all of the air is worked out of the master cylinder.You will still need to bleed the entire brake system when you place the new master cylinder on the vehicle as air will be in the system from taking the lines off, this will just reduce the amount of air.

Jul 31, 2014 | 2001 Pontiac Bonneville

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I have a 1994 bonneville that you have to push brake pedal to floor and fluid empties within 1 day. Is it the master cylinder or the line?

check all brake lines and wheel cylinders for leakage. if no leaks its probably the master cylinder. symtoms are-- pedal will sink to floor when stopping or not. or master cylinder leaks from behind "it", and runs down brake booster. if booster goes bad the pedal will be very hard! good-day !

Sep 07, 2011 | 1994 Pontiac Bonneville

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Brake lines keep busting even new ones that were replaced

You have a master cylinder and splitter problem that is allowing too much pressure to the lines or you have the routed incorrectly and they are pinching. Since the latter is not very likely I recommend replacing the Master Cylinder and if that doesn't fix your problem then look at the splitter. (This assumes you have a separate splitter coming off the master cylinder where the 4 lines connect to that instead of the Master cylinder directly.)

May 19, 2011 | 1997 Pontiac Bonneville

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I think i need a master cylinder in my 1994 pontiac bnneville? How hard/easy it it to replace myself. I can purchase ne for around 50-60 dollars.

Yes it is not that hard to replace.

  1. Retainer and electrical connector from fluid level sensor.
  2. Drain brake fluid front mister cylinder reservoir.
  3. Reservoir hose from master cylinder. Plug hose to prevent fluid loss and contamination.
  4. Brake pipes from master cylinder. Plug open pipes to prevent fluid loss and contamination.
  5. Two attaching nuts.
  6. Master cylinder.
  7. Reservoir, if it is to he used on replacement master cylinder.
  1. Reservoir onto master cylinder, as needed.
  2. Master cylinder on to power booster.
  3. Attaching nuts. Tighten to 27 Nm (20 lb. ft.).
  4. Brake pipes. Tighten brake pipe fittings to 15 Nm (11 lb. ft.).
  5. Reservoir hose onto master cylinder.
  6. Fill master cylinder reservoir to full level mark using only Delco Supreme 11 Brake Fluid, or equivalent DOT 3 brake fluid.
  7. Electrical connector to fluid level sensor, secure with retainer.
  8. Bleed hydraulic system.
  9. Recheck fluid level in reservoir

Mar 09, 2011 | 1994 Pontiac Bonneville

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I have a 1985 pontic bonneville...and i change mc..and brake calibers..still hve kno presser..i bleeded ????? is do they hve lines for front and back..or it all one line plz help..

All 4 corners of the car need to be bled after replacing the master cylinder. Start with the right rear, than the left rear, than the right front, and finish with the left front. Keep bleeding each one until absolutely no air comes out. Make sure you do not let the master cylinder run dry!

Sep 26, 2010 | 1985 Pontiac Bonneville

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Replaced the steering column in a 93 bonneville and now it won't start

the igntion cylinder and the VATS module are not the same
you will have to replace the igntion cylinder from the column you took out
the security codes are different
hope this helps

Nov 22, 2009 | 1993 Pontiac Bonneville

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My brakes lose pressor

Sounds like master cylinder on it's way out. If pedal pushed, then ease off slightly but keep constant pressure on pedal & it fades to floor, I'd say master cylinder, if no sign of fluid loss.

Jul 11, 2009 | 1992 Pontiac Bonneville

3 Answers


I would replace the master cylinder. If there isn't a massive leak in your lines chances is are it's the master cylinder or the brake booster. Cylinder is an easier job. Try a junk yard if your looking to get it cheap.

Jun 07, 2009 | 1995 Pontiac Bonneville

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