Did you test the booster as I prescribed?
Disc conversion problems...
- Thread starter Red 409 63 impala
- Start date
You never answered can you get a firm brake pedal with engine off?-forget booster
Red 409 63 impala
Well Known Member
Yes I tested the booster as you described, it with the engine off the pedal is firmer, but with a lot of pressure it will go to the floor. It gives the appearance of needing to be bleed, but after bleeding and pressure numerous times it never improves.
YOU HAVE AIR OR BAD MASTER. I WOULD SAY AIR, YOU HAVE TO BLEED IT, PROBABLY 4-5 QUARTS OF FLUID HOW MUCH FLUID HAVE YOU USED SO FAR?
Red 409 63 impala
Well Known Member
I have ordered a new master cylinder,mine came with the car when I bought it.i have gone thru seven 12 oz. containers of DOT 5 fluid.
Ouch
DOT 5 may be the problem. I bet it's passing by the cup in the master. All my suppliers do not warrant if DOT 5 is used.
Did you used a conversion kit or did you piece together the parts to upgrade to discs brakes? I ran into the same thing when converting my 63 to discs brakes turned out to be a rod adjustment on the pedal and using a power bleeder and she was good to go.
Red 409 63 impala
Well Known Member
Well I replaced the master cylinder....seems much better. Still have not driven on the road. Doing loops around the house they seem to work much better.
i hope I did not make a big mistake using dot 5.
i hope I did not make a big mistake using dot 5.
ragtp66
Well Known Member
Check the hole in the back of the master cylinder also. Some have a shallow hole and some have a deeper hole where the pushrod goes. If it is a deep hole you have the wrong master that is for manual brakes so the rod does not fall out. The correct master should have the shallow hole. Power brake is typically 1 1/8" bore manual usually is 1" bore master cylinder.