RR caliper sticks big time - Why??

PSeyle

Well-known member
Joined
May 28, 2001
Location
Riverside, CA
TDI
96 Passat Black
about a year ago I was on a road trip (Maine to California) and had the rear claipers replaced with genuine VW parts on my 96 Passat Sedan.

Now the caliper in the right rear is doing it again, but worse! supposedly the guy flushed my break line with new fluid, but I'm about to go through the system myself (usually what you have to do if you want things done right)

What would cause a caliper to stick shut?
the E-brake is not sticking.
the caliper is about one year old (30K miles).
weird stuff. Anyone have the answer I need??

TIA
-Preston
96 Passat TDI Sedan

[ January 29, 2003, 11:40: Message edited by: PSeyle ]
 

Metalnerd

Vendor , w/Business number
Joined
Nov 14, 2000
Location
Greensburg, PA, USA
TDI
96 Passat TDI Storm Grey
I had the same event on my 96 passat. Same side. My guess was that the caliper cable return lever has a relatively weak spring and corrosion causes it to hang up.
 

Lug_Nut

TDIClub Enthusiast, Pre-Forum Veteran Member
Joined
Jun 20, 1998
Location
Sterling, Massachusetts. USA
TDI
idi: 1988 Bolens DGT1700H, the other oil burner: 1967 Saab Sonett II two stroke
Another 96 Passat, another stuck rr caliper.
I'm suspecting that mine is due in part to a torn boot around the piston. Some rust has formed on the outer surface of the piston. This may be preventing the piston seal from relaxing and pulling the piston back when fluid pressure is released.
The piston within the slave cylinder is perfect, only the exposed portion is less than ideal. The piston will require replacement with the next pad change.
The self adjusting parking brake mechanism reacts as if the pad had worn and takes up the excess slack. Make sure that the parking brake mechanism and helix are well and properly lubricated to prevent excessive or unwanted self adjustment.
 

Lug_Nut

TDIClub Enthusiast, Pre-Forum Veteran Member
Joined
Jun 20, 1998
Location
Sterling, Massachusetts. USA
TDI
idi: 1988 Bolens DGT1700H, the other oil burner: 1967 Saab Sonett II two stroke
Oh,
I see the problem. Your car is aging much too quickly. On another post you have a 96. On this one it is three years older!
 

Rick P.

Veteran Member
Joined
Jul 20, 2002
Location
Barrie, Ontario
TDI
'97 Passat, Tornado Red, RIP Feb 17, 2006
That's what I thought when I tore into mine last month. Once I pulled everything apart I found that what looked like rust was just caked-on grime and rubber gunk. It cleaned off easily and I reused the original piston. Just be careful not to scratch the surface when taking it out.

Regarding the original question, if the caliper is sticking I wouldn't think it should matter whether the brake is engaged using the brake pedal or the parking brake lever. Makes me wonder whether the tech who did your last brake job re-adjusted your parking brake when he installed the new caliper. Are you sure that the RR caliper is actually working when you apply the parking brake?

As you suggested, your best bet (cheapest anyway) is probably to pull it apart yourself and see what's happening.

Rick

Originally posted by Jonathan Bartlett:
I'm suspecting that mine is due in part to a torn boot around the piston. Some rust has formed on the outer surface of the pisto ...

The piston within the slave cylinder is perfect, only the exposed portion is less than ideal. The piston will require replacement with the next pad change.
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jag60mk2

Well-known member
Joined
Oct 18, 2002
Location
Little Egg Harbor, NJ
TDI
Passat Sedan and Wagon, 1997, Green
PSeyle,

Take a look at this post: http://forums.tdiclub.com/NonCGI/ultimatebb.php?ubb=get_topic;f=42;t=000087 .

This has been discussed for the Passat previous to the above post also. My 97 had the LR stick. It happened after driving in the rain and putting the parking brake on. The next morning, it stuck. Since then, I have only used the parking brake when absolutely necessary. I also found that the brake works quite well when pulled up ONLY ONE click. I had been pulling up to get a couple of clicks.

Matt Ross
1997 Passat TDI 92K miles
1960 Jaguar MK2
 
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