Wouldn the brake system work better without that check valve in the master cylinder? What is a check valve doing in there?
Thanks for your review of this matter, David Hagberg ANSWER: 1928 SERIES 12B BRAKES David, The check valve in the master cylinder bore is there to maintain a few pounds of pressure in the brake system once you take your foot off the brake pedal. That keeps the lip of the rubber cups pressed against the bores of the master and wheel cylinders to prevent leaks at those points. Remove that valve and there will be brake fluid leaks at the cylinders. Things that could cause the problem you mentioned. 1. Master cylinder check valve is installed back wards. The check valve housing should curve toward you when you look down into the master cylinder bore. If it doesn’t have a “domed” housing it’s a VERY old one and should not be used regardless of how good it looks. 2. On 28’s and 29’s the foot brake connecting rod (part # 36080) may be out of adjustment. The foot pedal should return to as high a position as will allow the compensating port in the master cylinder bore to NOT be covered up by th
