|
|
Joined: Jul 2020
Posts: 23
Grease Monkey
|
OP
Grease Monkey
Joined: Jul 2020
Posts: 23 |
Hello everyone...I just renewed my membership after the lapse of many years and now am "renewed" in getting my 1939 MD back on the road. I replaced my two rear wheel cylinder and the master cylinder with new quality parts. Here's the problem, my brake petal goes all the way to the floor and will not pump up. I "think" I have bled all four wheels correctly (you never know). I found out thru Google that the master cylinder needs to be bled. The demonstration videos showed more modern master cylinder applications using tubes etc. that don't seem appropriate for my "oldie". I may have missed other possible "fixes". Any help will be greatly appreciated.
Last edited by Baggins; 07/08/20 05:51 PM. Reason: spelling
charles selkirk
|
|
|
|
JOIN THE VCCA and get access to the member-only features of the forum, including the ability to upload photos. You'll also receive our monthly magazine "Generator & Distributor". Yearly membership as low as $25!
|
|
|
|
Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
|
|
ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
It is not necessary to bleed the master cylinder first but does speed up the bleeding process.
Were the wheels bled in the proper sequece?
Proper seqnence is left rear first, tnen left front,right rear and last the right front.
Gene Schneider
|
|
|
|
|
Joined: Sep 2009
Posts: 6,689 Likes: 21
ChatMaster - 6,000
|
|
ChatMaster - 6,000
Joined: Sep 2009
Posts: 6,689 Likes: 21 |
The bleeding sequence bleeds the longest distance from the master cylinder (MC) fluid has to travel first. second, third and then fourth. Gene has given you these fluid traveling distances by identifying the corresponding wheel cylinder locations. Straight line distances from the MC is not the same as fluid traveling distances. Best, Charlie 
|
|
|
|
|
Joined: Jul 2020
Posts: 23
Grease Monkey
|
|
OP
Grease Monkey
Joined: Jul 2020
Posts: 23 |
Hi Gene, Thank you. How do I bleed the master cylinder?
charles selkirk
|
|
|
|
|
Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
|
|
ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
To bleed the master installl a line where the main line goes and bend th line around to fill into the master cylinder . Then fill the M/cyl with fluid and pump.
This was never done until the late model cars with dual master cylinders came along. Was unheard of in 1939 or 1949 or 1959.
Gene Schneider
|
|
|
|
|
Joined: Jul 2020
Posts: 23
Grease Monkey
|
|
OP
Grease Monkey
Joined: Jul 2020
Posts: 23 |
charles selkirk
|
|
|
|
|
Joined: Dec 2007
Posts: 4,024 Likes: 99
ChatMaster - 4,000
|
|
ChatMaster - 4,000
Joined: Dec 2007
Posts: 4,024 Likes: 99 |
You might need to adjust the brake. If the shoes and drums are worn the pistons in the wheel cylinders might be traveling so much that they use the full volume of fluid pushed by the master cylinder without making the shoes hit the drums.
Rusty
VCCA #44680
|
|
|
|
|
Joined: Jul 2020
Posts: 23
Grease Monkey
|
|
OP
Grease Monkey
Joined: Jul 2020
Posts: 23 |
Good idea Rusty...Thanks!
charles selkirk
|
|
|
|
|
Joined: Sep 2002
Posts: 2,323 Likes: 6
ChatMaster - 2,000
|
|
ChatMaster - 2,000
Joined: Sep 2002
Posts: 2,323 Likes: 6 |
If each wheel cylinder piston had .10” to move, the entire pedal stroke would be used up. I find that figure fascinating!
My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .
|
|
|
|
|
