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Rubber master cylinder rod retainer
#2686044
08/09/19 01:57 PM
08/09/19 01:57 PM
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Joined: Nov 2004
Posts: 16,450 On the run…
BloFish
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I am installing a new dual master cylinder, Wagner R88783, for my Scarebird disc brake swap on my A100 and discovered the rubber retainer provided is significantly smaller than my rod. There is no groove on the rod, and the rod seems to fit in the cup of the master cylinder just fine without it. Is the rubber retainer necessary?
*My old single master cylinder did not have one installed. But it was replaced by the previous owner some 20 years ago.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Rubber master cylinder rod retainer
[Re: GoodysGotaCuda]
#2686050
08/09/19 02:15 PM
08/09/19 02:15 PM
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Joined: Nov 2004
Posts: 16,450 On the run…
BloFish
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Then I will need a thinner push rod. When I force the rubber retainer on the rod, the overall diameter is larger than the master cylinder opening.
Thanks for the advice.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Rubber master cylinder rod retainer
[Re: RapidRobert]
#2686051
08/09/19 02:18 PM
08/09/19 02:18 PM
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Joined: Nov 2004
Posts: 16,450 On the run…
BloFish
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std protocol for manual brakes is for the MC rear piston "thimble" to have a shallow circular recess about halfway down the "tapered" barrel for the neoprene nub to lock into & for the manual brake pushrod to have a narrowed shank near the end for you to slip the nub over/past the rounded end. this might not apply to MC's that lock the pushrod in place I can see the recess in the thimble, nut I still don’t think the rod will slip far enough into the rubber retainer to make any difference.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Rubber master cylinder rod retainer
[Re: BloFish]
#2686055
08/09/19 02:26 PM
08/09/19 02:26 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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unless somehow the pushrod is locked in place as is, the neoprene nub has to be in that recess to retain the pushrod. EDIT & on your prior post I'm thinking wrong pushrod
Last edited by RapidRobert; 08/09/19 02:31 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Rubber master cylinder rod retainer
[Re: RapidRobert]
#2686060
08/09/19 02:34 PM
08/09/19 02:34 PM
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Joined: Nov 2004
Posts: 16,450 On the run…
BloFish
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I assume that the pushrod is original to the van. Perhaps there is enough meat that I can hollow out the bushing to fit the rod, or remove the 1/4” of play out of the pedal to assure a tight fit.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Rubber master cylinder rod retainer
[Re: BloFish]
#2686061
08/09/19 02:37 PM
08/09/19 02:37 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,040
Lincoln Nebraska
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stay after it & see if it looks like the MC or the pushrod or the nub needs to be changed/altered. EDIT I've just used a snip of vac line & cut a slight lengthwise groove in it like the ones that come with MC's have & slipped it over the round end but it sounds like something else is going on on your deal. Post how it turns out.
Last edited by RapidRobert; 08/09/19 02:53 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Rubber master cylinder rod retainer
[Re: GoodysGotaCuda]
#2686079
08/09/19 04:19 PM
08/09/19 04:19 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
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I would [and do] definitely run one. It's not needed until you shuffle your feet while driving and just pop "up" the brake pedal.
Not if there's a brake light switch at the rear end of the pushrod.
The INTERNET, the MISinformation superhighway
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Re: Rubber master cylinder rod retainer
[Re: John_Kunkel]
#2686126
08/09/19 08:50 PM
08/09/19 08:50 PM
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Joined: Nov 2004
Posts: 16,450 On the run…
BloFish
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I would [and do] definitely run one. It's not needed until you shuffle your feet while driving and just pop "up" the brake pedal.
Not if there's a brake light switch at the rear end of the pushrod. There is, and I removed the excess play in the rod. Fells nice and snug, no room for error
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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