Re: Questions re Universal power brake booster.

Posted by BH On 2009/9/22 11:08:16

Keith -

The seals that came in new, repro overhaul kits that I obtained from Kanter and others required no reworking of the counterbore. The rubber cup seal looks to be newly manufactured. The leather seal could be an off-the-shelf item, but I never looked into that.

As such, I personally see no reason to machine the counterbore except for damage, but - never mind scratches and scores - I haven't even found corrosion in the counterbore of any of the units I renewed that would require machining. Cores from field cars might be a whole 'nuther story, though.

If a rebuilder is modifying the counterbore to accept some sort of other seal, it seems to me that they made too much work for themselves - unless they have darned good reason for a seal of alternate design. If so, I'd like to know the whys and wherefores.

Personally, I've had no problem with the repro rubber seals, but would like to hear if others have.