Question about 1984 Plymouth Reliant

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Brakes bled them still no brakes how do i know if is master c or power booster

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  • Jonathan S
    Jonathan S Jun 01, 2010

    The brake booster usually causes the brake pedal to become very firm when it leaks.One way to isolate a master cylinder would be to put line locks on the front and rear brake hoses.Pumping the brake pedal after doing so if pressure build up and pedal reamins firm the master cylinder is probably ok but if pressure does not build or bleeds/sinks to floor the master cylinder is bad.You can also remove the mastercylinder from the booster and visually look if the back of the master cylinder is wet around the master cyl seal. Also I think this particular system is a cross bled system meaning the sequence is different from then normal.Usually the sequence is rr lf lr rf.

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  • Plymouth Master
  • 6,826 Answers

The booster only,I repeat,only makes the pedal operation easy,it does not have control over the brakes,it only make the pedal easy to apply.

Posted on Jun 01, 2010

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Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
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#1) Check and make sure your Power brake boosters Hose is not Cracked or just not a tight fit going to Intake.

#2) Since you Have Rear Drum Brakes You might have left to much Brake to Drum Clearance==Ajust rear Brakes out to Just give you good clearance to slide Drum Over Brakes.

#3) Check all your Brake Lines for Possible leaks.

#4) CHECK to make sure your Accuating Rod from your Brake Pedal to your Power Brake Booster is in the Rear of Boosters Piston that whenb you apply brake its Acctuating the Power Booster.

#5) Also did you bench bled your Master before instaling? If not you'll have to bled your master clylinder 1st, and then Start at farest wheel from master cylinder and work your way to the brakes on front Drivers side.

#6) only other thing that comes to mind is your Anti Brake Module.

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