C60L wheel cylinders

[Frank v R]

Hi guys, need a jobber # for the wheel cylinders for the C60L , hope some one can help

[rob love]

You are looking for the 1-1/2 inch wheel cylinders. Try a Dorman W4511 or else a raybestos or Wagner WC4511. Rock auto lists them at between $45 and $68. A quick check here in Canada with NAPA shows them under p/n NUP 4511 and retail at $130.28/jobber price $79.99.

I think I have purchased them through Amazon.com even cheaper. Yep, just checked and they are $36.21 with free shipping in the US.

The master cylinder, if you use the correct part number, (Cardone select 1334572 ) is only $35 or so from Rock Auto. NAPA under NUP4572 will run you retail $108 trade $78.

[Bob Carriere]

Hi Rob

Are you sure it is a CMP master cylinder?

The one I have seen seem to be the correct size BUT the mounting studs are very different and will necessitate fabricating a bracket.

If they are a perfect bolt on match it would be the first time they are available in a long time.

Cheers

[Grant Bowker]

Originally Posted by rob love

The master cylinder, if you use the correct part number, (Cardone select 1334572 ) is only $35 or so from Rock Auto. NAPA under NUP4572 will run you retail $108 trade $78.

Rob - If the master cylinder you mention, NAPA NUP4572, is the same as NAPA part NMC P4572 - it looks more like a Ford (also CMP trailer) master cylinder. proper link (inserted by moderator)
The Cardone number you give looks more like a Chev number (7 digits) but it isn't a number that appears in the C15A list (which gives 5450260 as the master cylinder assembly) and the shape of the master cylinder looks more Ford-like than Chevrolet to my eyes. proper link (inserted by moderator) sorry - the whole link didn't take on link properties, you may need to copy and paste the long string to see what I was trying to say. Just out of curiosity, I looked in the Chev Master parts book 1929-1948 and 1334572 doesn't appear there either.

Are you sure the master cylinder you are describing is a Chevrolet part suitable for CMP use? What I'm used to seeing in Chev CMPs from C8a to C60L (exceptions include C60X and maybe C8) look more like the attached image from TM 9-1827C on Wagner Lockheed Brakes. As Bob said, I also haven't seen any new master cylinders identical to Chevrolet CMP (other than a very few NOS) in many years. The last one I saw was posted at http://www.mapleleafup.net/forums/sh...aster+cylinder

[Lynn Eades]

Rob, I thought you did a great job of that post, making the effort to put up as much helpful info as you could.

[rob love]

You guys are right.....I buggered up the master cylinder number. It is for a Ford. I am so used to working with the Fords that I completely missed the "C" in the C60L.

I have in the past used the Ford master on the Chevs when in a pinch. An adapter bracket only takes a few minutes to make up, although you also have to custom make the pushrod to fit as well. But the plus is that you get an easy to source master cylinder that is matched to the wheel cylinders.

Note that the last four digits of any of these parts, be it the cylinders or the master, almost always end in the same four digits. It would almost seem to be a trade standard, or it could just reflect the source (China) of the parts and that they adopted the original Wagner numbers to some degree.

[rob love]

Would this link be more for the cylinder you guys are looking for? It is listed as being for a half ton, so I am unsure of the bore diameter, but if it is the appropriate size, then it may well be possible someone is making these up again.

http://www.ebay.com/itm/1941-1942-19...74e806&vxp=mtr


http://www.classicpartsusa.com/produ...ster_Cylinders

[Grant Bowker]

That is the shape I exect in Chevrolet CMPs. Visually, I would guess it is a smaller bore than the 1-1/4" used on CMPs, likely the 1 " bore typically found on the half tons.
I don't have the technical knowledge to tell if the greater volume of fluid displaced by the larger diameter cylinders is truly needed or not for safe, efective braking.
On one hand, the smaller cylinders should deliver more pressure for the same input by the driver's foot but on the other, if it runs out of volume before generating enough travel of the wheel cylinders for full engagement the extra pressure is useless.

Coming back to the question of wheel cylinders - parts list C60L-03 gives the following part numbers, all Ford format numbers

Front Cylinder assemblies-
92Y2261 (1-3/8" dia.) Note A
91T2261 (1-1/2" dia.) Note B
C118Q2261 (1-38" dia) note B
Note A - On jobs with 5" Joint. Not used after Serial No. 184-281-27 except when 10.50x16 Tires are used.
Note B - On jobs with 6" Joint and 10.50x20 Tires. On and after Serial No. 184-28127.

Rear Cylinder assembly
91T2261 (1-1/2" dia.)

I came up with the same cross reference you did for the 91T2261 cylinder. For the 92Y2261, I got Dorman W4571 and Wagner WC4571 priced $30-44 Cdn at RockAuto

[rob love]

Yep, the 4571 is the smaller diameter cylinders on the smaller vehicles. But if I recall the 60cwt uses the large dia cylinders all around. But to that end I just checked tha manual and you may be right Grant...1-3/8 shown for the Fords as well on the fronts.

A call to the supplier of the chev master cylinders may answer the question about the diameter. I think I see the word "argentina" in the casting....not a usual supplier of brake parts. It would be interesting to find out if the smaller diameter master cylinder would work for the 15cwts, or even for the HUPs. I will have to cross that bridge eventually when I get to my HUP.

[Grant Bowker]

C8, C8A and C15 follow a bit different pattern as they use more Chevrolet parts.
Bsed on parts list 175 dated January 1941 the C8 and C15 use 5300869 for the front, C8 uses 5300866 for the rear while C15 uses 5450071.
The same parts list shows all C15A to C60 and CGT using 92Y2261 front and 91T2261 rear. This is consistent with the listing above showing a difference between early and late production of the C60L as this is an early parts listing. Parts lists C15-02,C15A-04, C30-03 shows the same wheel cylinders throughout (i.e. no change between early and late production or small/large axle joints) while C60S-03 shows the same pattern shown in C60L-03 of using 1-3/8", then 1-1/2 but suggests they then switched back to 1-3/8 for large joints and tires (no mention of 10.50x16 tires on later production). I suspect one of the lists may have a typo??? CGT-03 lists more variants but follows the 1-3/8, 1-1/2, 1-3/8 front with 1-1/2 rear cylinders, I didn't find it 100% clear on first reading which CGT got which size front wheel cylinders..
List C8A-04 for the HUP shows 92Y2261 front and 5450071 (replaced by 5451208 when stock depleted) Based on Rob Clarke's late 1945 1C11 "staff car", there may be a later list that could be even more informative as there are inconsistencies between that vehicle and the C8A-04 list.
List C60X-04 gives 91T2261 as used all round throughout production, regardless of which master cylinder and booster system were employed.
One odd thing observed is that Parts list 197 dated August 1942 lists the cylinders for C8 and C15 (same as parts list 175) but I can't see the listing for C15A to C60 and CGT. Does anyone else with the list 197 see it the same way or am I missing pages or going blind?
I don't see anything in the service bulletins (incomplete set) I have about converting from one wheel cylinder size to the other as a maintenance modification.

The Chevrolet Master Parts List 1928-1949 lists 5300869 as being front 1-1/4", used on all 1936-48 comm. and util. (except DS ES and FS - all 1 ton trucks). 5300866 is listed for 1936-48 comm. rear 1-3/16 and GD, HD, JD, KD, AL, BL (all 3/4 ton trucks with 11' brakes) and 5450071 for 1936-48 rear 1-3/8 GE, HE, JE, KE (all 3/4 ton trucks with 14" brakes), KF, AM, AN, BM, BN, DR, ER, FR (mixture of 3/4 and 1 ton). 1-1/4 seems to be the largest front wheel cylinder Chevrolet used in this period. For 1-1/2 and 2 ton utility (includes truck and school bus, both regular and COE cabs, single and dual rear wheel) they used a 1-1/2 rear wheel cylinder assembly 5450553. Original costs were $4.00 or less.

[Hanno Spoelstra]

Did you guys browse through the thread Modern part numbers for CMPs in the sub-forum Parts/Sources/Prices?

HTH,
Hanno