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<Audi> HD rear brakes - 200tqw
This is my follow-up post describing my experiences with installing the
'heavy duty' rear brakes on my '90 200tqw (US version). With this
information, anyone who wants should be able to do what I did.
First, let me thank the following q-listers for their help and information;
it wouldn't have been possible without them:
Paul Weston (WMSBrakes@aol.com) at Weston Motorsports
Chris Semple (Autobahn01@aol.com) at Autobahn Motors
Frank Bauer (email@example.com)
Linus Toy (firstname.lastname@example.org)
Bottom line - I did the upgrade; it works great. There is some braking
improvement, but it is subtle. It should be useful when I start towing
things. Would I do it again? Probably not; the cost/benefit ratio is way off.
Upgrade description - standard rear brakes on the 5k/100/200 (pre '91)
wagons are a solid rotor setup. A factory upgrade was to a vented rotor
setup, variously described as a 'trailer towing' or 'heavy duty' rear brake
option. These HD brakes were standard on the '91 200q (sedan & wagon) and
the '90 & up V8's. It is a fairly serious upgrade; rotors go from solid
(10mm) to vented (20mm); disc diameter increases to 269mm from 245mm; and
the master cylinder and caliper cylinders are upgraded.
Parts required - all are Audi part #'s w/approx prices (US dollars):
447-611-021 Master cylinder (25.4 x 18/18); $200
447-615-423/4 Right/left calipers (43mm pistons); $135/rebuilt; $250/new
447-615-425-A Caliper carriers (2 needed); $142/apiece (OUCH!)
441-615-611-A Splash shields (2 needed); $25/apiece
447-615-601-A Rotors (269mm/20mm); $64/apiece + $38/apiece for slotting
(NOTE: Brake pads, hoses, and emergency brake cables are the same.)
Total price: approx $1,000. Big sigh. However, if you skip upgrading the
master cylinder, found the caliper carriers used, found rebuilt/used
calipers, threw away the splash shields, and skipped the rotor slotting you
could do this for around $400 (*much* more reasonable). I needed a new
master & calipers anyway, and kept using the "it's only a little more to do
it right" line.....
Hope this helps someone else...e-mail if you want any more info.....SLM
Steve Manning: email@example.com (Metro D.C. area, USA)
....Mainly Mopars; also '88 90Q/'90 200tqw/'88 635csi; other stuff
......BMWCCA #93xxx, FCA, USCC, QCUSA, Wagons of Steel, etc.