I'd like to buy a new Delco master cylinder for my '70 with power disc brakes. I'm tired of changing out leaking aftermarket junk. If anyone has a part #, I would be grateful.

Jim

Yes AC Delco still has an the original style master cylinder availible. (big bail in front, smaller in back). It's AC Delco part number 18M18 and it's GM part number 18030260.

www.partszoneonline.com (http://www.partszoneonline.com) (a/k/a P&G Chevrolet in Slovan, Pennsylvania) has it listed for $42.12. I've dealt with P&G many times in the past, actually grew up not too far from the place. If you call, the parts manager's name is Bill, tell him I referred you, he is a good guy. The best part about them is they charge actual shipping, not a flat rate so the good deal doesn't get killed by the shipping charges.

Good luck and BTW, I completely understand your frustration of dealing with the leaking aftermarket junk. It's amazing what these companies can sell.

Is this the correct style for a 70? with a single bail and the square style?
Thanks.
Ron

Thanks Bryan! I have a few other GM part numbers i'm checking out on that web site and the prices do look good. Once I get it, i'll post a picture of it Ron.

Thanks again,

Jim

[QUOTE]Originally posted by elcamino72:
[QB] Yes AC Delco still has an the original style master cylinder availible. (big bail in front, smaller in back). It's AC Delco part number 18M18 and it's GM part number 18030260.

Bryan
Is this master cylinder the one that has bleeders on it??
-Kid

The picture on the AC delco site does not have bleeders ... it's not going to be 100% correct as it's a different part number than original, but at least it's an GM part.

I just bought the master cylinder at a local GM dealer for a few more dollars more than P&G had it for, but I wanted it for this weekend. It seems it will work fine, but it does require the short booster pushrod, which i'm having a difficult time finding. See this post (http://www.chevelles.com/forum/ultimatebb.php/topic/7/9128.html)
I will list some clear pictures of the cylinder this weekend for anyone thinking of buying one of these as soon as I can get my camera flash to work right.

http://members.cox.net/chevelle/1.jpg

Jim

Hi Jim! that is the stock 1.125" master as used for power brakes. G.M. never used that for manual brakes, because when you let up on the pedal, the rod will fall out of the master, causing serious problems! Manual masters always had the deep hole, and were 1" bores only. The 1.125" master is too stiff to push for most people with out power. Few, if any, automatic cars came with manual discs, because you have to pull the engine down with the brakes in an automatic. A 4 speed, you could kick it out of gear, stab the pedal, and sit there. Bob

P.s. We can supply you with a 1" deep hole master, or any type of booster for that car. Bob

Bob, thanks for the input. As far as I know, the booster I have is for a power disc setup. Here's a pic.

http://members.cox.net/chevelle/booster.jpg

I bought this unit rebuilt about a year ago and it came with the long rod. Is it possible to use the shorter rod and make the parts I have work? Also I have read that in 1970 both long and short rod configurations were used on power brakes, it all depended on the car build date. However, I don't know if that's true. I would be interested in having my porportioning valve rebuilt if you offer that service.

Thanks,

Jim

yes, the short rod will work in that booster.