| Re: [GMCnet] Replace Master Cylinder or MC plus Booster? [message #327402 is a reply to message #327398] |
Thu, 21 December 2017 19:46   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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The booster replacement is not the easiest process, but, involves removing
the bezel on the dash, then the air valves in the dash. This will allow
access to the clip that secures the brake pedal linkage pin to the piston
operating rod as well as the 4 nuts that secure the booster to the
bulkhead. Depending upon the year model. There is also a mounting bracket
that is accessed from under the drivers side hatch that braces the
booster/master cylinder assembly. Sometimes, there is a black, nasty,
sealant that has been applied to the bulkhead that makes removing the
assembly difficult as well. Best advice, refer to the shop manual.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Dec 21, 2017 5:29 PM, "James Wack" wrote:
> Seeking part number and source for brake booster and MC assembly, or just
> the correct booster. Background: When pressure bleeding the brakes
> following rear axle caliper replacement, I developed a leak at the back of
> the MC where it meets the booster assembly. I see the booster/MC seal is
> available for $40ish from several Corvette resto shops, but then age of
> the MC and booster are unknown and from their appearance, could well be
> original. I previously bought a new Wagner MC (Part No. MC79821), but am
> now thinking, for that level of effort, I should replace the booster as
> well.
> Just not sure what I'm getting into regarding the Booster replacement.
> It seems straight forward enough, except for the uncertainty with finding
> the
> correct replacement parts. I cannot find a cross for the GM 18001970 or
> 18002562 booster. No luck at http://gmcmhparts.com. I've read quite a
> bit
> of discussion on the topic of the MC mounting bracket and booster seal,
> but not so much on replacing this entire assembly. Anyone done this?
> --
> Wackster - 1976 23' Crestmont
> Baltimore, Maryland
>
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