Help - Bench Bleed Master Cylinder

Reply Subscribe

Thread Tools

Search this Thread

Jul 13, 2008 | 10:55 PM

98IndyPacer

Thread Starter

Racer

Joined: Aug 1999

Posts: 466

Likes: 71

From: West Chester PA

Help - Bench Bleed Master Cylinder

I’m having trouble getting a firm brake pedal after going through about a gallon of brake fluid doing pedal bleeding. I decided to pull the master cylinder to bench bleed. Since I don’t have the bench bleeder fittings (new Wagner master cylinder didn’t come with one) I wanted to make a setup using steel brake lines and a tubing bender.

I have manual brakes on my 1972 small block with 1” bore master cylinder. What sizes are the brake lines that connect to the ports on the master cylinder?

Thanks, Ed

Jul 14, 2008 | 07:46 AM

RunningMan373

Melting Slicks

Joined: May 2007

Posts: 3,246

Likes: 4

From: Bay Area CA

just go down to the local Autozone or whatever and ask for a bleeder kit, HELP section has one I think, like 5 bucks, come swith about 5 diff fittings. btw the two on the M/C are diff sizes. i got my kit, but it's buried. C.

Jul 14, 2008 | 12:31 PM

Project80

Racer

Joined: Mar 2008

Posts: 428

Likes: 0

Quote:

Originally Posted by RunningMan373

Just get the kit, it works very well.

Jul 14, 2008 | 08:42 PM

98IndyPacer

Thread Starter

Racer

Joined: Aug 1999

Posts: 466

Likes: 71

From: West Chester PA

Thanks for the replies. I found the master cylinder port sizes today. For the 1972, non-power brake, master cylinder the port sizes are 1/2-20 and 9/16-18. I went to the local AutoZone and they don’t carry the bleeder kit. I did find one at Napa Auto Parts, labeled as Master Cylinder Bleeder Kit with part number 700-1132.

Just finished bleeding the master cylinder, took about 15 strokes to get all of the air out. After installing the master cylinder I will pressure bleed the system using a Motive Pressure Bleeder but how do you remove the plugs, transport to the car and reconnect without getting too much air in the system?

Thanks, Ed

Jul 14, 2008 | 09:36 PM

dannyman

Melting Slicks

Joined: Dec 2006

Posts: 2,669

Likes: 3

From: Kingston Ontario

Put the cap on the reservoir and then remove the lines. Hook up the vehicle lines before removing the reservoir cap. Then you should be good to bleed the system.

Jul 14, 2008 | 11:56 PM

BigBlockTank

Melting Slicks

Joined: Sep 2007

Posts: 2,429

Likes: 0

From: Tucson AZ

When I changed my master cylinder, I installed it, put plugs in the front and rear hose ports. Pumped it until all the air was out, connected lines and bled again thru the wheel cylinders. I don't have a rock hard pedal, but I have power and it works like a champ.

Jul 15, 2008 | 05:38 AM

stingr69

Le Mans Master

Joined: Mar 2004

Posts: 7,477

Likes: 1,495

From: Little Rock AR

Quote:

Originally Posted by 98IndyPacer

Leave the bench bleeder kit installed. Bolt the master cylinder on then the last thing you do is remove the fittings before you hook up the lines. If you have the Motive pressure bleeder you will be finished in no time at all.

-Mark.