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Old 09-26-2016, 11:28 AM   #1
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Join Date: May 2006
Location: Bremerton,WA
Posts: 19
Master Brake Cylinder upgrade

Have an 05 Alpine that I'm going to upgrade the master brake cylinder on. In looking for a replacement, precision rebuilders show a Bendix conversion cylinder part # 34928 which is on back order. The wagner part # 131759 appears to be the same one but when looking on eBay, they show a cylinder by centric # 130.79025. Does anyone have any experience knowing if these are all the same cylinder? They all have the ABS connection and the port sizes are 1/2' X20 AND 9/16 X 18. The one at precision rebuilders states it has seats but not sure what that really means.It appears that in looking at some of the posts that they are the same but just wanted to double check.


05 40' FDQS
Alpine limited

Ron and Soni
2005 Alpine Coach FDQS
2014 Honda CRV
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Old 09-26-2016, 10:28 PM   #2
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Join Date: Sep 2009
Posts: 427
I upgraded mine in 2012 with a Wagner F131759, which is the same one everybody used at the time. It was a good upgrade. I don't know about all the other part numbers you mention. For brakes if it were me, I would not use ebay and use the Wagner # only

I use Brake Systems Inc in Portland OR. They probably have it in stock and there is no sales tax here. 503 236 2116.

2007 Apex MDTS (425 hp) #75723
2007 Toyota 4-Runner
2014 Ram Laramie 3500
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Old 09-28-2016, 11:38 AM   #3
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Location: Bremerton,WA
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update master cylinder

Here's what I have found out on the Wagner master brake cylinder part # 131759. I called Brake Systems inc in Portland and they were very helpful. They couldn't find one in Portland so they called Wagner this morning. It is on a nationwide backorder meaning that they are currently not making the part, and only if there is enough demand will they tool up to make it again. So the other choice is to go with the Centric model # 130.79025. Not sure where it is made but he did say he didn't think Wagner was making them in the US anymore so it could be Mexico or ???. I'm going to take a chance on the Centric and see what happens. Appreciate the help
Ron and Soni
2005 Alpine Coach FDQS
2014 Honda CRV
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Old 09-29-2016, 08:19 AM   #4
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Ihave an '06 Apex 40 MDTS, and it exhibits the same same braking characteristics as the '07 36FDDS we used to have, i.e. really have to stand on the brakes to haul it down. With my somewhat limited understanding of hydraulics, in order to increase the master cylinder effectiveness, wouldn't the piston bore have to be smaller, thus increasing the pedal travel as a side effect? I use the engine brake on max. at all times to enhance my braking capability. If this other cylinder would significantly increase the braking power sans engine brake, I would definitely get one.
Dudley Do-Right
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Old 09-29-2016, 08:51 AM   #5
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A search of this topic on the forum will reveal that the cylinder in the "upgraded" version of the MC has a 1 3/4" dia. piston vs the 2" piston in the OEM MC. Believe the 131759 part number listed above is the upgraded MC, not the OEM. The OP suggests that the OEM MC is on back order--not clear what the availability is for the upgraded MC. My 03 has the larger dia. OEM MC but not the pedal pressure issue associated with the newer adjustable pedal models. I've helped 4-5 owners replace the OEM MC with the smaller dia. upgraded MC--all have reported improve braking response with little or no "detectable" change in pedal travel.......
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2003 40' MDTS
Garden Ridge, Texas
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brake, upgrade

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