Brake booster leaking in 77 M880

[bwhite757]

Getting ready to purchase another brake booster to replace the one on my truck. Any difference than the W200 brake booster for the same year, or do I need to be looking for a different one?

TIA

 

[bikeman]

Should be correct. But I have no verification of that.

 

[dodjh]

bwhite, have you found a source for a replacement brake booster?

 

[dodjh]

Does the Brake Booster on the M880 need a gasket between firewall and BB and MC and BB? Installed a spare I had and saw remains of gaskets on each location.

I didn't put gaskets back (didn't have any and couldn't see the need for it) but having a hiss when brake pedal is depressed. MC has been bench bled but not wheel cylinders yet.

Check valve is fine and no vacuum leaks...well, not if the hiss is a vacuum leak.