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Brakes don’t work!!! New master cylinder, bad brake booster??

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Old Oct 31, 2020 | 09:47 PM
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Brakes don’t work!!! New master cylinder, bad brake booster??

Hey I just bought a 86 sport coupe roller, I put a Vortec 350,z28 rear end with disc, and the body kit off a z28 real nice car.
but I went to bleed my brakes after installing and bleeding the master cylinder and the booster is making a swooshy air noise when you press the brake. The brake pedal only goes halfway down and then has a click noise when pressed down as far as it goes. When the car is off and on, The rear brakes seem to be engaged a bit all the time and the front driver brakes the only one that works correctly and the passenger front brake isn’t getting fluids all. I’ve bled em about 3 times for hours. Can anyone help me before I go by a new brake booster??

1986 camaro sport coupe/z28 Vortec 350
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Old Oct 31, 2020 | 10:24 PM
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Re: Brakes don’t work!!! New master cylinder, bad brake booster??

Probably a vacuum leak in the brake booster
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Old Nov 1, 2020 | 01:01 AM
  #3  
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Car: 89 GTA, 84 T/A
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Re: Brakes don’t work!!! New master cylinder, bad brake booster??

Is the front passenger brake not getting fluid when you are bleeding it?

If so you probably have a collapsed brake hose.
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Old Nov 1, 2020 | 01:42 AM
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Re: Brakes don’t work!!! New master cylinder, bad brake booster??

I Looked at the passenger brake line before putting the motor in, I tried bleeding them a little when I put the master cylinder on to stop around the yard and only was getting 2 or 3 good air squirts out the back calibers and then no fluid for about 10 bleeds then it repeats and still the same. This was the same when after I put my engine and Edelbrock 600 carburator and connected the Vacuum line to the booster and tried to bleed em with the car on. Still nothing. I opens the resivoir and pressed the pedal slowly and seen only the back resivoir was only bubbling but the front one was losing the fluid and not bubbling air out??? Thank guys
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Old Nov 1, 2020 | 01:56 AM
  #5  
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Car: 89 GTA, 84 T/A
Engine: L98 stock, Carbed 350
Transmission: 700r4
Axle/Gears: 3.27
Re: Brakes don’t work!!! New master cylinder, bad brake booster??

Even if the brake booster is bad, I believe you should still be able to bleed the brakes. It would just make the brake pedal hard to push, as you are not getting any assistance from the booster, and are providing all of the force.

A bad brake hose is not something you can visually see, they collapse inside and look fine from the outside.

They fail in one of two ways I have seen.

They will not let any or very little brake fluid through. The second, they allow brake fluid through one way, to the caliper, but do not let it back out, causing the brakes to drag.

When you replaced the master cylinder, did you bench bleed it, or bleed it on the car?

If I remember correctly the back of the reservoir goes to the front brakes, and the front goes to the back brakes, but it has been awhile and I could be wrong.

How are you trying to bleed the brakes?






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Old Nov 1, 2020 | 09:19 AM
  #6  
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Re: Brakes don’t work!!! New master cylinder, bad brake booster??

Okay I bleeded it on the car with two lil hoses back in the resivoir till all the air was out, then filled her up closed the resivoir and turned my car on, started bleeding passenger rear with a hose in Gatorade bottle on the bleeder with a little bit of fluid and pumped till I seen the new fluid steady going thru and did the same, driver rear, until I got to the front passenger brake line and no fluid was even coming the hose line
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Old Nov 1, 2020 | 12:11 PM
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Car: 89 GTA, 84 T/A
Engine: L98 stock, Carbed 350
Transmission: 700r4
Axle/Gears: 3.27
Re: Brakes don’t work!!! New master cylinder, bad brake booster??

You probably still have air in the master cylinder, they need to be bled with the cylinder not the reservoir level.

If you are not getting fluid at the passenger front something is plugged.

Remove the bleeder screw from the caliper, if you still don't get any fluid, disconnect the hose from the caliper, and see if fluid is making it down the hose.

If you don't have fluid there disconnect the hose from the hard line.

You may have damaged the hard line when you swapped engines, the line for the passenger front goes across the K-member.

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Old Nov 1, 2020 | 12:39 PM
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Re: Brakes don’t work!!! New master cylinder, bad brake booster??

Originally Posted by allos
...You may have damaged the hard line when you swapped engines, the line for the passenger front goes across the K-member.
Good call , given the fact that the engine was just swapped and now the front right brake is getting no fluid , the poor brake line likely got mashed somewhere between the removal of the old engine and the new one getting put in .

However , the whole business of "The brake pedal only goes halfway down and then has a click noise when pressed down as far as it goes" mentioned in post #1 leads me to believe there are other things amiss along with the squished brake line .
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Old Nov 2, 2020 | 09:29 AM
  #9  
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Re: Brakes don’t work!!! New master cylinder, bad brake booster??

Hardline was kinked somewhere, thank you guys I just went went to autozone got a new line and bent it along the crossmember to the soft line, bled em now my booster and brakes works great. Thanks guys!!
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