Re: 200 rear caliper problem

[Andrew Duane USG <duane@hunch.zk3.dec.com>]

Hairy green toads from Mars made Peter Schulz say:

> Need a bit of help/advice.  I finally found why the brakes on the TQW
> felt mushy..the rear brakes were not operating, due to the emergency
> brake cam not releasing.  I sprayed the spring and cam on the calipers 
> liberally with WD40, and the passenger rear seams to be working now,
> 
> However the driver's rear caliper is still sticking, even after WD40
> and forced operation of the cam.  The good news is that the e-brake
> lever, which once could be raised to the upper limit, now has less than
> two inches of travel, and I don't appear to have a rusted emergency
> brake.
> 
> I searched the qlist archives but could not find any tips on dealing 
> with this problem, and bentley does not appear to go into any detail
> in rebuiding the rear calipers on this issue, only covering piston and
> seal replacement.
> 
> Could someone explain how the emergency brake closes the caliper, so that
> I have a better understanding of what is causing the binding, an whether
> the caliper can be rebuilt or whether I should spring for a rebuilt one...

This happened on my 100Q. Unfortunately, it seems that you have to
get another caliper, unless you can find a good shop that is willing
to dismantle this one and grind things down.

This little e-brake lever is definitely the weak link in the
design of these calipers.

-- 

Andrew L. Duane (JOT-7)			duane@zk3.dec.com
Compaq Computer Corporation		(603)-884-1294
110 Spit Brook Road
M/S ZKO3-3/U14
Nashua, NH    03062-2698

Only my cat shares my opinions, and she's too psychotic to express it