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TR6 1973 TR6 Rear Brake Operation Questions

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J

Jerryny

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Good Morning all,

I'm trying to understand how the rear brakes on my 1973 TR6 work.

My understanding is: When you press the brake pedal brake fluid is sent to the left and right wheel cylinders. The wheel cylinder then pushes the front brake shoe against the drum. What I don't understand is: What is supposed to push the rear shoe against the drum? Probably a dumb question but watching it in operation I don't see the rear show moving outward. Is this normal? All help is appreciated

Thank You
Jerry
 
Rod-H

Rod-H

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Not a dumb question at all. The rear brakes are semi-free floating (for lack of a better term).
Simplified: When you press the brake pedal the wheel cylinder expands to force the leading brake shoe to contact the brake drum. Then after the front shoe makes contact, the wheel cylinder shifts as pressure is applied to cause the rear shoe to come in contact with the drum. Both brake shoes in contact. When you release, the springs and brake drum rotation cause everything to return to original position.

Rod
 
Madflyer

Madflyer

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Jerry; If you are getting no movement to rear shoes there is a splitter after master cyl for brake failed. This will need to be reset by bleeding front brakes to move piston to open rear brake line. Madflyer
 
Andrew Mace

Andrew Mace

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Madflyer said:
Jerry; If you are getting no movement to rear shoes there is a splitter after master cyl for brake failed. This will need to be reset by bleeding front brakes to move piston to open rear brake line. Madflyer
Click to expand...
What you describe is the PDWA (Pressure Differential Warning Actuator). Its only purpose is to activate a warning lamp when there is a pressure difference between front and rear circuits. It does not shut off anything!
 
OP
J

Jerryny

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Rod-H said:
Not a dumb question at all. The rear brakes are semi-free floating (for lack of a better term).
Simplified: When you press the brake pedal the wheel cylinder expands to force the leading brake shoe to contact the brake drum. Then after the front shoe makes contact, the wheel cylinder shifts as pressure is applied to cause the rear shoe to come in contact with the drum. Both brake shoes in contact. When you release, the springs and brake drum rotation cause everything to return to original position.

Rod
Click to expand...

Thank you very much
 
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