Question about 1989 Plymouth Voyager

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Brakes are spongy,light keeps coming on,even after bleeding them

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  • Nathan May 11, 2010

    Did you change the brake pad when you were bleeding them?

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Most likely the "sponginess" is the result of one of two things: 1. a bad master cylinder; 2. Air in the brake lines. (an unlikely reason for the problem is that the piston rings in the brake calipers are shot, but that's very unlikely)

The easiest way to eliminate air in the brake line issue is to bleed the (front) brakes (back brakes are not disc and can be diagnosed if the parking brake works- since it's a cable... I think). Bleeding requires two people- one behind the wheel depressing the brake pedal to the floor and holding, while the other opens the bleeder, then shuts it once the pedal is held at the floor- note: make sure one is observing if any air or inconsistent flow comes from the bleeder upon the brake pedal being depressed, this is KEY! Oh, and a new bottle of brake fluid, a floor jack, tire iron (or equivilent), small wrench to open the bleeder and something to catch the fluid while your buddy is smoothly and quickly depressing the brake pedal to the floor- all while the bleeder is open- then close the bleeder, and release the brake pedal. If air or a spray, rather than constant fluid flows from the bleeder, you've merely kept the brake line issue in the running- albeit the likely problem, but it may not only be the result of a one-time air infusion into the lines. That is, air has to get in somewhere, and we're talking about a twenty-year-old american-made auto here. But, if it's constant fluid, it's unlikely the brakes have air in the lines. Finally, make certain you keep the master cylinder full of fluid, with the cap of it off, while bleeding- otherwise you'll be repeating the process for a long time, since it'll **** air in if empty-ish. If you rule out the brakelines, then a shop should help you with the rest, since it's fairly in-depth to do any more.

A few final tips: do both front brakes, regardless of finding air on your first side. And finally, pump the brake and hold it (while vehicle is not running) prior to depressing the pedal to the floor- and specifically, only open the bleeder once the pedal has been pumped and is being held- upon the bleeder being opened, the pedal will go all the way to the floor, hold the pedal and close the bleeder.

Good Luck!

Posted on Jun 25, 2009

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  • Master
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There's a couple of areas to check that can cause spongy pedal.
If when bleeding the brakes, you pulled air into the lines, that'll do it... Be sure to bleed all lines, start at the furthest point. Check the fluid level frequently....don't allow the Master Cylinder to empty out and **** air.
Check the brake adjustment on the rear wheels if there's drum brakes... If your shoes are a fair distance from the drum, you'll be pushing alot of pedal to make the proper contact.
I suggest pulling the rear drums and checking all the hardware...
It could be a failing master cylinder as well. Look around the master and check for leakage. Hold the pedal... does it drop slowly?
Visually inspect all lines, hoses and connections to make sure everythings ok.
If after all that and the pedal firms back up, if the light is still on, you may be able to "recenter" the brake warning light on the master cylinder by having someone holding pressure on the pedal while you quickly crack and retighten one of the fluid lines at the master.
Let us know what you find out!
K

Posted on Jun 25, 2009

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  • Plymouth Master
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If there are no leaks from wheel cylinders, calipers and lines, likely there is a bypass condition in the master cylinder. If so, replace it.

Posted on Jun 25, 2009

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you should get them checked""

"i would be carefull driving"

but if you dont think air got trapped in there.....you should try upgrading those rubber hoses to steel kind.....

hope this helps XD

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