View Full Version : power brakes

12-29-2015, 02:02 PM
Installed a power disc brake kit on a 57 with stock 292. It seems to have a lag in the power assist when applying the brake. Anyone else have similar issues?

Joe Johnston
12-29-2015, 02:10 PM
Are you using the original style Midland remote booster?

12-29-2015, 02:11 PM
Are you talking about the power assist unit under the dash. Did you install a modern booster and master cylinder when you converted to discs. You don't need to use the power assist unit with discs.


12-29-2015, 02:12 PM
Nope, no lag. What kid did you buy?
When you apply pedal, that opens a vacuum valve. Push lightly and it opens it slightly. Push hard and the valve immediately opens all the way making it work like a servo valve.

Are you sure you have the booster set correctly to the M/C?
Did you properly bench bleed your new M/C?
Is all air out of the system?
Are all the firewall/booster/master bolts tight? Any flexing will subtract from pedal response. - Dave

12-29-2015, 02:35 PM
Make sure you have a large enough vacuum fitting at the intake manifold hose- same size as the fitting to the booster, and the hose should be the correct size as well, and connect directly between the two fittings in a short run with no taps into it.

12-29-2015, 04:26 PM
It was the original type remote booster.

12-29-2015, 04:28 PM
Owner claims it was a Classic Disc brake kit. I actually thought it came from Thunderbird USA.

Joe Johnston
12-29-2015, 07:29 PM
Check the Midland for vacuum leaks, properly functioning check valve, and re-blead the booster. The Midland units do add boost but they will not be as powerful as our "modern" disk brake cars.

Joe Johnston
03-26-2016, 08:48 PM
Finally got back to posting. I had my Midland remote booster rebuilt by Whitepost Restorations and it works well. The core I sent was corroded inside and needed sleeved which is what they specialize in and had no problem with the rebuild. Quick turn around time and a warranty too.