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Senior Member
Join Date: Oct 2012
Location: Eastcoast
Posts: 883
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I’m ready to bleed adjust my brakes on the 36. I have pretty much a 39 system with a early mustang drum/drum M/C.
Everything is backed off at the shoes and the lines are all dry. I was planning on adjusting the brakes before bleeding the system as per the instructions below. My theory was I didn’t want to push the pistons too far out before the brakes where adjusted. Now I am wondering if I should bleed the brakes first, that would activate the residual valves in the master cylinder to the approximately 10 psi. Or does it even matter? *******ADJUSTING BRAKES ******** ADJUSTING ANCHORS ON ’39-‘41 FORD/MERC BRAKES: These are Ford Lockheed (not Bendix) brakes and use special brass washers in conjunction with eccentric anchor bolts to position the shoe. The top of the shoes are controlled by eccentric cams. The anchor bolts at the bottom of the backing plate control the shoe position by rotating eccentric washers at the bottom of the shoes. Before starting to adjust, verify all anchor bolts turn freely. The ’39-‘4 use anchor bolts which have locating marks (either a dot or an arrow for position reference) indented on the elongated ¼” head of the bottom adjusting bolt. These anchor bolts extend through the backing plates from the drum side and are adjusted externally after loosening their large external lock nuts. After adjusting the shoes, the adjustor lock nuts are tightened without permitting rotation of the anchor pin adjusters. (1) Always rotate the wheel in the same direction the wheel turns as when the car moves forward. (2) Begin by backing all the way off, the two 11/16” eccentric adjusters at the top of the backing plate until the wheel turns freely. Then slightly loosening both bottom anchor bolt lock nuts (3/4”) on the back of on backing plate. Turn all of the two elongated locator marks (either an arrow or a dot) on the 1/4" adjusters so they face each other. (3) Further adjustments are made by turning the anchor bolt adjusters in a SPECIFIC direction..... (a) Driver’s side. The front shoe anchor ¼” adjuster bolts (with the dot or arrow) on the both the front and rear wheels are rotated counter-clockwise when looking at the back of the backing plate. The rear shoe anchor ¼” adjuster bolts (with the dot or arrow) on both the front and rear wheels are rotated clockwise. This is VERY important. (b) Passenger side. The front shoe anchor ¼” adjuster bolts (with the dot or arrow) on both the front and rear wheels are rotated clockwise when looking at the back of the backing plate. The rear shoe anchor ¼” adjuster bolts (with the dot or arrow) on both the front and rear wheels are rotated counter-clockwise. This is VERY important. (4) Now turn one of the upper adjusting 11/16" eccentric cams until the wheel cannot be turned. Adjust its 1/4" anchor bolt in the correct direction until the wheel just does turn. This lowers the shoe and moves the toe of the shoe away from the drum, which will result in fuller shoe contact. (5) Repeat step (4) over and over on the same shoe until turning the anchor bolt will not free-up the wheel. (6) Back off the upper anchor pin very slightly until the wheel will just barely turn. Tighten the anchor pin lock nut (3/4”) and then adjust to the other shoe on that wheel. (7) Thereafter, it’s common to never needing to adjust anything other than the top eccentric cam. TIP: If you’re installing new shoes, which have been arc-ground to fit the drum, you normally will not have to go through the preceding exercise. Turn the dots/arrows until they’re facing towards each other and tighten the ¾” anchor pin nuts. This correctly positions the brake shoes and you don’t have to go through the anchor pin adjusting..... just adjust the upper 11/16" cam adjusters. ADJUSTING ’42-’48 BRAKES: The anchor pins are different than the ‘39- ’41 Lockheed brakes, but do not have any reference marks on the backside of the anchor bolts. And they adjust differently. Instead they have one flat side ground on their large round shallow bolt heads. The flat sides are turned so they face each other. This is usually al the adjustment needed due to the semi-floating design of the anchors. Tighten the large nuts (which are on the inside of the brake drum)and put on the brake drum. Adjust the upper eccentric cams and you’re through. |
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