Question about 1990 Toyota 4Runner

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1990 4Runner bakes are soft

Just bought a 1990 4Runner and the brakes have fluid and are not leaking but are very very soft. What are some issues that I can trouble shoot

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One more thing to add to mnabi01's list is a frozen caliper, either the sliders or piston. mnabi01 gave you great instructions, I agree with them. Best wishes.

Posted on Jan 20, 2009

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Soft(low) brake pedal has 5 possible cause
1 air in system
2master cylinder bypass
3fluid leak
4rear brake shoes out of adjusmet(too far from drum)
5spongy brake pads
if there is no leak and the fluid is at level I would adjust rear brakes and bleed system.If that did not work replace master cylinder.

Posted on Jan 20, 2009

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2002 Chrysler town and country, always had soft brake pedal, replaced calipers and master cylinder bled brakes several times problem still there, suddenly pedal got full but brakes started dragging.


A soft or spongy brake pedal is an indicator that there is air in the hydraulic line(s) of your brake system.
Improper bleeding could be a cause.
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Look inside the brake booster for fluid.. pull the vacuum hose from it and check from there .. some times brake master cylinders leak and the as where the fluid will collect.. also if h have drum brakes in rear they too could hold fluid that may not show the leak

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New to FixYa-not sure how this works.Soft brake are typically associated to a fluid/ master cylynder issue. Without viewing & knowing particulars via driving habits, mileage, etc, it is hard to duduce specific issues. Your front brakes have greater stopping pressures than the rear brakes which means they wear down quicker than the rear brakes. If you have a soft/mushy pedal, you may have worn brake pads which also leads to the brake fluid resevoir being low (shoe diminishment to increased fluid use-ratio)-you can fill the resevoir and pump up/ solidify the pedal but when you replace the pads, the fluid will overflow the resevoir.There are also indicators on brake pads that cause a high pitch squealing when the pads are low-again, without a visual or specific info like "do you hear any squealing while braking, how many miles on vehicle-the current set of brakes, do you tow anything, etc...", it is hard to diagnose; kind of like a doctor diagnosing a belly ache over the phone - there are so many factors/variables from the vagueness, it makes the situation a "guessing game"..If you can include more definitive info, it may narrow down the issue without a visual inspection. There are a lot of other components that could be the issues but the pads/low fluid will be the most common.Hope this does not cause more harm than good. G2

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Just asked how ti fix my issues with the brake problems I am having


When you say leaking off, I assume the pedal is soft or goes to the floor when depressed. Since all of the major brake system components have been changed, the brake lines are the next suspect. DO you notice any loss of brake fluid from the reservoir? Do you see any fluid leak on the ground or at the wheels?

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I have a 96 geo prizm. I have replaced the front and back brakes. I have bled the brakes and the foot pedal is firm for about the first4 days. After the 4 days the brake pedal gets really soft and you...


It sounds like master cyl. is drawing in air causing prob. also another test would bee too bleed out and get pedal back, now step on pedal and hold firmly and see if pedal creeps near floor indicating innternal leaking in master cyl. also have some one pump bakes slowly aand look for air bubbles in brake res. after bleed out indicating master cyl. is drawing air upon release of pedal.

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You might have a leak in one of your brake lines i would look at all of the lines for a leak look at the brake drums for fluid driping out of the bottom if you dont find a leak it may be time for a brake job . a soft peddel means you have air in your system.From a leak or wore out pads or shoes or a leaking wheel cylender from wore out rear shoes . watch your master cylender to see if its low on fluid.

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Brake drum is leaking fluid very badley. soft brake peddle


Don't drive it -- have it transported to a shop for repair -- it's dangerous!

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