[200q20v] Rear Caliper sticking?
peschulz at cisco.com
Mon Oct 16 12:41:28 EDT 2000
At 12:16 PM 10/14/00 -0400, Kneale Brownson wrote:
>I found that manually retracting the lever, soaking it with penetrating
>oil repeatedly and even totally disengaging the e-brake cable would not
>stop the brake from dragging. I think the internal brake actuating
>fixtures remain stuck once they're sufficiently corroded. I even turned
>the pistons back in after disconnecting the cables, and the brakes
>returned to binding against the rotors within a couple applications of the
JJ, Kneale, et al...
BTDT on both my 1990 CQ and the 200...what has happened is that shaft of
the parking brake cam has corroded...On the 200, I gave up after being
trying the method repeatedly, and not regaining full operation - the good
news is that you can call Mack at Clair Parts Connection, and get a pair of
rear rebuilt calipers with pads for about $200, with core exchange....
1991 200 20v TQW
Chelmsford, MA USA
peschulz at cisco.com
from Chris' web page: http://members.aol.com/c1j1miller/index.html
This weekend Peter Schulz showed me how to conduct periodic maintenance on
the one of the rear calipers on my 200q20v. The car had the typical
symptoms; braking seemed diminished; sticking rear parking brake.
Chock, jack, block, remove a rear wheel. Remove guide pins, clean, inspect
boots over guide pins. One of my guide pins was seized, as the rubber boot
had torn; cleaning and lubing restored it. Next year, new guide pins all
Once the pins are removed, pull the floating caliper free, and hang it with a
wire or bungee for strain relief on the rubber brake line. Use the caliper
tool to turn the face of the caliper back in a ways. Remove the parking
brake return spring, then remove the retaining bolt for that spring. Pry the
parking brake lever down away from the caliper, and clean the shaft. I used
some very fine emery paper to remove corrosion, sprayed with brake cleaner,
then lubed it with a brake grease. Push the shaft back in place, reinstall
the spring and retaining bolt.
Pull the two pads off the caliper frame, and clean their mounting areas. One
of my pads was frozen in place. I cleaned the sliding portion of the backing
plate with a file, and scraped the corresponding area on the caliper. Put
the pads back, making sure the inner pad goes back on the inside...
Put the caliper back in place, put loctite on the guide pin retaining bolts,
and torque them back up. Pump the brakes a bit to reseat the caliper/pads.
Reinstall the wheel, torque up the bolts, lower and unblock car, then clean
Probably an annual chore.
From the 20v Web page: http://20v.org/20v/brakprob.htm#handbrake
An inoperative or weak handbrake can be a disastrous thing. It might just
need to be adjusted, but a common problem problem is the cams on the rear
get frozen with rust. To check/fix the operation of the cams:
1.Handbrake off, car in gear, front wheel blocked by a wheel chock,
rear end lifted SECURELY by jackstands.
2.Under the car, follow the handbrake cable to the rear calipers--they
attach to a cam which also has a circular spring held in place by a slot in
and a 10mm bolt. The cam is attached to a shaft internal to the
caliper. This shaft, in turn, applies mechanical pressure on the rear
3.That shaft is not protected externally by a boot and tends to collect
rust. The rust prevents the spring from tensioning the cam, which in turn
gives little or
no feedback to the handbrake--hence the "out of adjustment" feel.
4.Carefully compress the spring and removed it, then pull the handbrake
brake cable out of the cam slot. If the cam is difficult to move back and
then you've found your problem.
5.Liberally spray lubricant/rust remover around the cam shaft and work
the cam back and forth to it's limit stops repeatedly. Let the lubricant
soak in for a
while, then repeat several times. The cam should now move easily,
allowing the spring to apply tension and feedback to the handbrake.
6.If the cam is badly rusted, you can try taking it all the way out to
clean it up. You'll have to remove the piston from the caliper first,
though. If refuses to
move, you'll have to get new calipers.
7.When you feel like the cams are freed up, apply some brake grease to
the exposed part of the cam shaft, then put it all back together.
8.It is rumored that stronger springs from some Ford model will help
keep this problem from happening. The Ford P/Ns are: 6141147 & 6141148.
Peter C. Schulz peschulz at cisco.com
Quality Systems Engineer/SSE http://www.cisco.com
Customer Contact Business Unit (CCBU) Direct: 978.275.7772
Cisco Systems, Inc. Fax: 978.275.5299
900 Chelmsford Street Pager: 800.365.4578
Lowell, MA 01851 USA
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