Question about 1983 Cadillac Eldorado

1 Answer

Brakes get hard and no vacuum from motor

The brakes get hard while driving,I will pull overand pull booster line..no vacuum! So I turn off car and wait a few mins,then when I restart car I have vacuum and brakes are normal.i replaced old vacuum pump that was tapping with another one that was bad because it free spun and did not suck or blow out the tubes.i put mine back one and this is what is happening.is the vacuum pump going bad? Is their another part that could cause these issues that I am missing? Thanks for any help.

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  • Kristi Cantor May 10, 2013

    I vacuum tested all the lines and replaced any that did not hold.also tested modulator on trans and egr. I put my finger over i bottom vacuum hole on pump and turned the wheel it moved around with pressure from one hand,does this mean the diagram is weak? Could iit not be holding enough vacuum? Is that how you test these pumps?

  •  Stephen
    Stephen May 10, 2013

    There should be a check valve on the power brake booster. That valve is supposed to "hold" vac inside the booster. The pump only produces vac while it is running. The hose between the pump and the booster could be damaged inside and blocking the vac at times. Rare but it does happen. I would probably rig up a gauge in the line going to the brake booster and check to see if vac is present when the engine is running. The booster could be leaking.

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  • Cadillac Master
  • 21,873 Answers

The pump boosts engine vac so yes it could be a failing pump.
You could also have a hose that is collapsing inside.

Posted on May 10, 2013

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Posted on Jan 10, 2009

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The brake booster is not the problem. The Master cylinder will need to be bench bled before bleeding the braking system.

Posted on Mar 26, 2009

cadman000
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SOURCE: '97 SLS - brake lights don't turn off when i release the brake.

I would definitely go after the brake light switch under the L/S dah at the brake pedal . Sounds like it might be sticking. Hope this helps

Posted on Apr 20, 2009

jgwhomeequip
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Check fuel pump pressure and fuel pump regulator. It sounds like you are not getting fuel into the system and if you are you are not getting enough fuel into the system

Posted on Jan 02, 2010

  • 1796 Answers

SOURCE: I have a 1999 Cadillac

Hi!!
There is a problem with the hole getting clogged right by where the engine connection is, use a piece of wire to unclog the orifice and reinstall the line. You should be OK after that.
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

Posted on Jan 04, 2011

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92 4runner everything been changed. Brakes, booster, line to booster. Still the same brakes are every hard to push. Can't figure it out any idea. .


Usually theres a plastic valve mounted on the booster thats connected to a vacuum source. Remove it from booster(they usually just pull out) & hose, then suck& blow on one end. Air should pass only one way. If it passes both ways the valve should be replaced. Check to c if hose holds vacuum by placing thumb on hose end to feel for suction (motor running) & to listen for hissing. Replace hose if suction is low &or hisses. Could be a vacuum leak elsewhere in wich case performance would suffer & idle would be eradical.

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I have a 1992 chev lumina Z34 with a 3.4 motor when the car is off the brake peddle is rock hard but when i start the car the peddle becomes soft and low. i have bleed the car more than once and the...


Master Cylinder (Brake System) :
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well aside from the boosters you may also want to check the possitioning rotor and calipers. there is a possibility that something slipped, or leaked, check for brake fluids and try to trace where it is comming from.

the picture below shows how to disassemble the brakes of an Accord, the only special tool you will need is a ball joint fork to seperate the upper and lower ball joints. You have to remove the whole steering knuckle assembly to get to the bolts in back of the rotor and hub assembly.

b8487ef.gif
hope this helps

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Had brakes when parked, replaced front rotors, pads, turned rotors, replaced brake lines no rear brakes replaced hubs,shoes wheel cyc, lines master cylinder, booster and bleed.bypassed abs system. could...


Sounds like you have an air lock in your distribution block or it could be a bad distribution block all together. Sometimes you can tap it lightly and the air lock will bleed out. Also check your vacuum booster. If it is real hard to press the brake petal down, with the motor running, the vacuum booster diaphragm is blown, or there is a vacuum leak in the line to the booster. Pull the vacuum line off the booster with the engine running to see if there is vacuum to the booster, this will likely make the engine stall out if the booster is working properly. A little trick I do when bleeding my brakes is take about 16 inches of clear tubing that fits the bleeder, then get a quart Mason jar stick the tubing that is attached to the bleeder into the jar, then add about and inch of brake fluid to the jar and start pumping the petal. Always keep an eye on the jar and your master cylinder as to not let the master cylinder run out, or the jar to overflow. Hope this helps, good luck. If I think of something else I'll do another post.

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Brakes are hard to depress causing stopping problem


1: inspect all brake linings first.
no pulling left or right braking?
the car has 100% full manual brakes. if the brake booster fails.
(its only and assist !!! for 50lb small folks)
so does it? it takes more pedal pressure but has 100% full braking.
this is no accident its by design.
make sure none of the brake shoes/pads are soaked in DoT3/4 fluid
or grease or gear oil.
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look, then look again. even behind and in front of the master cylinder.
look at tires (inside for fluid leaks>)
2: do the booster test. did the vacuum hose to it fall off?
or got pinched, or ?

google brake booster test
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if ABS get the ABS scanned.

if you cant stop correctly,,,,???? , dont drive.
get it fixed.

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