Built in America Posted May 8, 2023 Report Share Posted May 8, 2023 We are close to successfully fully restoring this beautiful 47 dodge 2 ton. Master cylinder restored, wheel cylinders restored, wheel cylinder pistons placed & restored, brake liners replaced, etc. We thought we properly tested our Hydrovac booster initially but brakes work at about a 75% success rate = pressing on the pedal truck comes to a rolling stop but not an immediate stop as necessary. ** We’ve checked the vacuum lines and they seem to be solid (no leaks), but will give it another check. We’ve made a major break adjustment to make sure that the shoes are properly meeting the drums, and completed a minor brake adjustment for the spacing between the brake pads and drums. Questions: 1. What is the proper method to test a Hydrovac booster when still installed? What are telltale signs that it needs a rebuild? 2. When adjusting brakes with wheel lifted off the ground how many rotations if any should the wheel make when brakes are adjusted properly? How much drag is OK. 3. Any resources for a Hydrovac booster rebuild kit, or are we better to purchase a new and donate the booster to our classic treasure chest Collection ?? Many thanks, Jason AutoOwners.org Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted May 9, 2023 Report Share Posted May 9, 2023 Midland single diaphram boosters were used on 1947 and up Dodge 1-1/2 to 2-1/2 ton trucks. Hydrovac's were used on GM trucks and others. I don't know anything about the Hydrovac booster. As for the Midland they work 110% when working correctly. I have driven my 2-1/2 tonner for ten years and the brakes were as good as modern truck brakes. Easily lock them up and still stop in a straight line in a cloud of smoke. As for rebuilders and other help...cannot advise on the boosters. 1 Quote Link to comment Share on other sites More sharing options...
Built in America Posted May 10, 2023 Author Report Share Posted May 10, 2023 On 5/8/2023 at 9:30 PM, Dodgeb4ya said: Midland single diaphram boosters were used on 1947 and up Dodge 1-1/2 to 2-1/2 ton trucks. Hydrovac's were used on GM trucks and others. I don't know anything about the Hydrovac booster. As for the Midland they work 110% when working correctly. I have driven my 2-1/2 tonner for ten years and the brakes were as good as modern truck brakes. Easily lock them up and still stop in a straight line in a cloud of smoke. As for rebuilders and other help...cannot advise on the boosters. Thank you for the feedback. We’re looking for a Midland booster. Turns out the farmer used what he had to get the brakes working and dished the original Midland. Our 47 1.5 ton has a midland = checked this AM. We’ll leave that one on the 1.5 ton in hopes that we can use it once we get that rolling next Fall. We’ll give the Hydrovac to a GMC owner that needs it. Now hunting for a Midland for a 2 ton. many thanks, Jason AutoOwners.org Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted May 11, 2023 Report Share Posted May 11, 2023 (edited) Wonderful looking trucks and owners who know what to do to keep them up and running the proper way!? Edited May 11, 2023 by Dodgeb4ya Quote Link to comment Share on other sites More sharing options...
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