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Author Topic: Backing plate wheel cylinder repair  (Read 5532 times)

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Offline larrym

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Backing plate wheel cylinder repair
« on: April 17 2015, 05:48:33 PM »
So my wheel cylinder shifted on me did a few searches and heard about a clamp or retainer but no part number. Called my local parts store and got a "huh" from them as well. Did some more digging on line Part # GMB25851 brake drum wheel cylinder bracket called the store back they had 5 sitting on the shelf.....my first call they asked if I wanted the circle retaining clip....



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86 white T type with t tops and blackout trim. 60lb injectors Gen 2 with Extender Chip TR6 ignition 212/206 roller cam Turbonetics BB CPT 61 CAS V4 Intercooler Cobbled together Alky Injection 4 inch MAF pipe with integral sensor
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Offline earlbrown

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Re: Backing plate wheel cylinder repair
« Reply #1 on: April 18 2015, 05:27:13 AM »
the hell is that?
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline larrym

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Backing plate wheel cylinder repair
« Reply #2 on: April 18 2015, 09:48:31 AM »
For wore out backing plates it holds the wheel cylinder in place.
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86 white T type with t tops and blackout trim. 60lb injectors Gen 2 with Extender Chip TR6 ignition 212/206 roller cam Turbonetics BB CPT 61 CAS V4 Intercooler Cobbled together Alky Injection 4 inch MAF pipe with integral sensor
2800 stall lots of fun with a little 6 banger!
Best ET 11.36

Offline Just a Six?

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Re: Backing plate wheel cylinder repair
« Reply #3 on: April 18 2015, 10:53:26 AM »
Good find I never heard of that before but if the Backing Plate is in Bad/Rusted condition wouldn't a new backing plate be in order & then maybe add that for extra insurance? It's your Brakes!   :O
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David
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Offline Forzfed

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Re: Backing plate wheel cylinder repair
« Reply #4 on: April 18 2015, 02:00:57 PM »
Quote from: larrym on April 18 2015, 09:48:31 AM
For wore out backing plates it holds the wheel cylinder in place.

The ones I used looked nothing like that.
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Offline larrym

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Backing plate wheel cylinder repair
« Reply #5 on: April 18 2015, 04:16:24 PM »

Quote from: Just a Six? on April 18 2015, 10:53:26 AM
Good find I never heard of that before but if the Backing Plate is in Bad/Rusted condition wouldn't a new backing plate be in order & then maybe add that for extra insurance? It's your Brakes!   :O

My backing plate was not in bad shape other than the rotated wheel cylinder saved me pulling the axles and made it easier to install the retarded clip   
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86 white T type with t tops and blackout trim. 60lb injectors Gen 2 with Extender Chip TR6 ignition 212/206 roller cam Turbonetics BB CPT 61 CAS V4 Intercooler Cobbled together Alky Injection 4 inch MAF pipe with integral sensor
2800 stall lots of fun with a little 6 banger!
Best ET 11.36

Offline earlbrown

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Re: Backing plate wheel cylinder repair
« Reply #6 on: April 18 2015, 04:55:35 PM »
Granted it will avoid pulling the axle...

But our backing plates are the same as S10s and are all over the junkyard. I'm just trying to imagine how a backing plate can wear out. It's not exactly a wear item.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline larrym

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Backing plate wheel cylinder repair
« Reply #7 on: April 18 2015, 05:29:44 PM »
Either my clip was weak the casting on the wheel cylinder was shit. The new wheel cylinder fit much tighter but for the sake of drilling 2 holes I installed the retainer. Spoke to a buddy who is a wrench he says it's common on gbodys and brake boosting only makes it worse
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86 white T type with t tops and blackout trim. 60lb injectors Gen 2 with Extender Chip TR6 ignition 212/206 roller cam Turbonetics BB CPT 61 CAS V4 Intercooler Cobbled together Alky Injection 4 inch MAF pipe with integral sensor
2800 stall lots of fun with a little 6 banger!
Best ET 11.36

Offline Just a Six?

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Re: Backing plate wheel cylinder repair
« Reply #8 on: April 18 2015, 06:35:53 PM »
Quote from: Forzfed on April 18 2015, 02:00:57 PM
Quote from: larrym on April 18 2015, 09:48:31 AM
For wore out backing plates it holds the wheel cylinder in place.

The ones I used looked nothing like that.

That's because you live in Winterpeg!!  :rofl:
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David
87 LTD. Purchased May 88
Doeskin leather, coach lites without Landau Roof, moon roof, carpeted trunk & No Factory Hood Ornament!
The sticker on AC shows a V-8 Carb car. Special order by Mr. Nick Hall VP of GM Canada
Runs 11.50 on 21 lbs with my old style 67 Q Trim & Alchy

Offline Just a Six?

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Re: Backing plate wheel cylinder repair
« Reply #9 on: April 18 2015, 06:37:30 PM »
Quote from: larrym on April 18 2015, 05:29:44 PM
Either my clip was weak the casting on the wheel cylinder was shit. The new wheel cylinder fit much tighter but for the sake of drilling 2 holes I installed the retainer. Spoke to a buddy who is a wrench he says it's common on gbodys and brake boosting only makes it worse

I'm sure the E Brake launches don't help either!
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David
87 LTD. Purchased May 88
Doeskin leather, coach lites without Landau Roof, moon roof, carpeted trunk & No Factory Hood Ornament!
The sticker on AC shows a V-8 Carb car. Special order by Mr. Nick Hall VP of GM Canada
Runs 11.50 on 21 lbs with my old style 67 Q Trim & Alchy

Offline gusszgs

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Re: Backing plate wheel cylinder repair
« Reply #10 on: April 19 2015, 09:17:20 AM »
Couldn't we just use an older "bolt in" style wheel cylinder,and just drill two holes to mount it??
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Jim
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