Chris Many
Well-Known Member
- Local time
- 8:31 AM
- Joined
- Aug 20, 2018
- Messages
- 247
- Reaction score
- 489
- Location
- Highgate Falls, Vermont
Hi Guys,
So I am rebuilding a master cylinder for my 1970 FM3 Satellite 318 Conv. It is an original power disc brake car. The master and booster were an unusable block of rust, so I located a matching master/booster assembly. same part numbers, built almost on the same day. 315th day of 1969.
The booster I had restored by Power Brake Booster in WA.
The master only needed a light bore and new seals, so I bought the correct NOS rebuild kit. I even confirmed all the part numbers with the parts manual. so I got the right rebuild kit and the right master.
Ok, so my problem is, is that the rear plunger sticks out the rear about 0.150", but it doesn't on the original, nor did it stick out on the rebuilt master before I took it a part. refer to pictures.
When I push the plunger in so that it is flush I can see that the opening is the same in the reservoir as the original (refer to picture).
I know that I am supposed to adjust the pushrod on the booster to have about 0.020" clearance with the rear piston in the master. Based on the original booster and the new booster, it looks like I really have a problem with my rebuilt master.
So, what is going on ? Do I just need to tighten up the spring on the rear piston or am I supposed to hold the piston flush while I use the booster pushrod alignment gage? The service manual is no help at all.
So I am rebuilding a master cylinder for my 1970 FM3 Satellite 318 Conv. It is an original power disc brake car. The master and booster were an unusable block of rust, so I located a matching master/booster assembly. same part numbers, built almost on the same day. 315th day of 1969.
The booster I had restored by Power Brake Booster in WA.
The master only needed a light bore and new seals, so I bought the correct NOS rebuild kit. I even confirmed all the part numbers with the parts manual. so I got the right rebuild kit and the right master.
Ok, so my problem is, is that the rear plunger sticks out the rear about 0.150", but it doesn't on the original, nor did it stick out on the rebuilt master before I took it a part. refer to pictures.
When I push the plunger in so that it is flush I can see that the opening is the same in the reservoir as the original (refer to picture).
I know that I am supposed to adjust the pushrod on the booster to have about 0.020" clearance with the rear piston in the master. Based on the original booster and the new booster, it looks like I really have a problem with my rebuilt master.
So, what is going on ? Do I just need to tighten up the spring on the rear piston or am I supposed to hold the piston flush while I use the booster pushrod alignment gage? The service manual is no help at all.