[urq] Brakes

[Buchholz, Steven]

... I am unfamiliar with the nomenclature you are using ... the urq (in
the US) came with the G54 (single piston) front calipers.  Many folks
have adapted the G60 (dual piston) calipers from the Type 44 cars to the
urq (along with the associated smaller diameter front brake rotor).  I'm
presuming that you meant to say G60 ... they should be fairly available,
you can probably get a rebuilt caliper at many good FLAPS ... 

>From my point of view fluid coming out a bleeder on the caliper with the
brakes released would more likely be a sign that there is a problem in a
master cylinder or somewhere other than the caliper ... when the brakes
are released the fluid should flow back toward the reservoir to relieve
the pressure.  You might ba able to tell if you have a sticky caliper by
comparing the brake temp of the left and right front after a short
drive.  Be careful, brakes get very hot even when used lightly ... don't
just grab the rotor with you hand as a test!  I've got a thermocouple
based temp probe for my DMM ... you can get infrared temp gauges
nowadays for a pretty reasonable price ... 

Steve B
San Jose, CA (USA)
> 
> Hi all,
> Upon going to Autobahn performance, I learned a sticky brake caliper
> may be the cause of the wobble I feel at speed.  Does anybody have a
> good place to get a new caliper?  I've sourced stainless lines from
> blau (25) and 2bennett (30), but if I have to get a new caliper, where
> is a good place to get an S60 right front?  I don't know if it's the
> caliper or line, but i'll see if I can figure it out when it warms up
> or I go home.  The PO said it has a brake upgrade, but I'm not sure
> which...I assume it's the s60...or is it g60?
> 
> Also, the mechanic suggested, in order to test which is sticking, to
> press the brakes real hard, then open up the bleeder...if fluid comes
> out with no pressure on the pedal, then it should, in theory, be the
> caliper.  Correct?