Brake master cylinder

[4583C]

I am thinking about replacing a master cylinder part# 0541138-7 which from iwantcessnaparts.com is about 1.5 AMUs. After extensive searching of this forum I found that the Cleveland 10-35 is an appropriate substitute at about .35 AMUs and the Spruce catalog says of the Matco MC-5 "This master cylinder can be used in place of the Cleveland part number 10-35" At .0915 AMUs the Matco looks to cheap to be true. The IPC lists a different part # for the left and right...whats the difference? Enlighten me.

[4583C]

Well, I called Spruce and they said the Matco MC-5 doesn't come with an 8130 ... not surprising for less than 100 bucks. So I asked about the Cleveland 10-35 and it doesn't come with the paperwork either. Maybe we should just put another overhaul kit in.

[170C]

Would appear to be better to do an overhaul on one or both master cylinders vs replacing them unless there is something really wrong with the cylinder itself. Paul, you could always call Lucky at Dallas Air Salvage & see what he has in stock. By the way, what are those monetary items you mentioned

[4583C]

By the way, what are those monetary items you mentioned

Frank
I should have written it amu instead of AMU. See this thread for an explanation
http://www.cessna170.org/forums/viewtop ... ary#p52767

[GAHorn]

Paul, the Cleveland part is PMA and is eligible for installation per their STC (which you doubtless have already.)

[Waterboy]

I am in the process of replacing my master cylinders from the old style with the serated rod to Cleveland 10-35. I have STC SA13GL and can find no reference to master cylinders. My mechanic need some paper work. Could someone point me in the right direction for the paperwork approval.

Thanks,
Ken

[Bruce Fenstermacher]

STC SA13GL is to install Cleveland wheels and brakes, not master cylinders.

Those cylinders can be replaced by a Cessna Service Bulletin as I recall. I'll try to find that bulletin for you.

[Bruce Fenstermacher]

Well I could not find the approval, Service Bulletin (SB), Service Information Letter (SIL) or Service Kit (SK) that would allow the serrated ram type cylinders with the later (serial 19200 and after) cylinder. I did find the service kit SK7051-2 which is for changing the parking brake control from the old cylinders to the new.

Will keep looking. Perhaps someone else has this at their fingertips.

[n2582d]

I added Service News Letter dated June 5, 1952 to the Maintenance Library. Hope that helps!

This is what I've been able to find on part numbers for C-170 master cylinders by looking at the various IPC's:
-C-170 used Goodyear p/n 95-3681 which also went by Cessna print # 0411058
-C-170A, s/n 18003-19200 used the same one, p/n 0411058, with the serrated shaft as shown below. Apparently the serrated shafts have been known to break.

-C-170A, s/n 19200-20040; left brake p/n 0441019, right brake p/n 0441019-1. These were basically the original Goodyear master cylinders with non-serrated (smooth) shafts and a different style of locking the parking brake. A conversion kit, p/n 52-3-870, was offered at this time to update the C-170 and C-170A's prior to s/n 20041. This kit included the new rods and parking brake mechanism . If your plane has any remnant of either style parking brake system the recommendation here is to remove it to prevent inadvertent locking of the brake while airborne.
-C-170A s/n 20041 & on and C-170B, s/n 20267-24999; left brake p/n 0541138-2 which has been superseded to p/n 0541138-15 and right brake p/n 0541138-1 which has been superseded to p/n 0541138-14. (EDIT: the 170B IPC has the -1 and -2 numbers reversed from S.N.L. 06-05-52 for which goes on the left or right side.) I'm puzzled why there is a different p/n for the left and right master cylinder as all the individual parts are identical.
-In 1952 Cessna issued the above S.N.L. which authorized the replacement of earlier style master cylinders with p/n 0541138-1 and -2. (Now p/n 0541138-14 and -15).
-C-170B, s/n 25000 & on; left brake p/n 0541138-7 which has been superseded to p/n 0541138-17 and right brake p/n 0541138-6 which has been superseded to p/n 0541138-18. The only difference between the left and the right master cylinder is the lock plate which should not be used anyway.

[Bruce Fenstermacher]

Thanks Gary. I looked hard at the IPC which lists parts for the upgrade kit but didn't notice the new rods. I knew this was mentioned in an SNL and couldn't find it either.

It is of interest to me as my 170A has the serrated rods but I have no plans to replace them at this point in their 67 year life.

I also wonder given we know and do not recommend the new style parking brake setup, how many planes have been recked due to the new parking brake style control locking the brake causing a ground loop vs how many old style serrated rods would have broke and then cause an accident.

[Bruce Fenstermacher]

It would appear that the Cleveland 10-21 master cylinder would be the perfect replacement. A closer inspection would be prudent. However legality still needs to be established. I'd contact Parker and see if they have an STC or if this is PMA's to replace the Cessna product which BTW is over $4000 if you look it up on IwantCessnaParts.com

[n2582d]

Bruce, I see p/n 0541138 listed as superseded for the applicable dash numbers of -1,-2,-6,-7. Their superseded dash numbers of -14,-15,-17, and -18 are not shown. In addition to the Cleveland 10-35 and the 10-21 being possible alternatives (with a field approval?), I see that you mentioned that the Scott 4408 is an alternative here. Apparently some guys use the Scott 4408E as an alternative to the serrated master cylinder on the C-190. Even if it was available, one would have to be insane to buy a new master cylinder from Cessna at those prices. Especially considering how readily available they are at salvage yards.

[Waterboy]

I acquired a nice set of Cleveland 10-35 cylinders at a good price. But I am having trouble finding approval for installation.

I am still waiting for a call back from the tech rep at Cleveland, I talked to some one who was covering for him and he did not know of an approval for installation on the 170.

If any one has Cleveland 10-35 installed in their aircraft I could use some help with the how you went about the approval process. There are several threads on the 170 site that mention the 10-35s at the appropriate replacement. Including this from above but I am not sure where Gorge got the information and out of what STC?

Paul, the Cleveland part is PMA and is eligible for installation per their STC (which you doubtless have already.)

thanks,
Ken

[c170b53]

Bruce is there a " We want Cessna parts " site ?
As well the only difference between $4K cylinders and the $37,000.00 I was quoted for a 1979 XP mount, must be how much they want me to know, how much they don't want any part of small aviation.

[Waterboy]

I talked with the tech rep from Cleveland this morning. The installation of any Cleveland master cylinder will require a field approval.

Does any one have a copy of a field approval for Cleveland 10-35 master cylinders they would be willing to share a copy of?