Anyone ever have to replace the brake booster?

[Zack]

I can't get a good pedal to save my life. It's right at the top when the car is off.
While driving if I pump the pedal 3 times it stops awesome. Otherwise the pedal will be soft.

I've honestly never had a bad brake booster on any car I've ever owned.
New MC, IDS bled, no air in the lines.
SMH!


EDIT: Just ordered an ABS delete manifold.

[Shaijack]

The older you get the softer it is.

[martyo]

Did you make sure it is not losing vacuum?

[Zack]

Did you make sure it is not losing vacuum?

Don't cars usually run rough when that happens?
21in at idle, goes up to 25 when I let off the gas

[martyo]

Don't cars usually run rough when that happens?
21in at idle, goes up to 25 when I let off the gas

Not always if the vacuum is bleeding down after stopping.

I had a brand new bypass blow apart on a disc conversion I did a few weeks ago and had a lousy pedal. Strange things happen.

EDIT: As I am typing this I am rethinking here. You say that the pedal is fading? I am starting to lean on the idea that the master may be bad. I had this happen on the DPB car that I sold to Brad Wells.

[mrjones]

I've replaced several over the years. On most, it's caused the car to run bad at idle or at least when the brake was depressed. I have had one old Ford truck that did not run bad with a bad booster. My current 77 Ford pu has a bad booster and I'm about to replace it. It's idling funny and has a weak pedal too.

[Zack]

Not always if the vacuum is bleeding down after stopping.

I had a brand new bypass blow apart on a disc conversion I did a few weeks ago and had a lousy pedal. Strange things happen.

EDIT: As I am typing this I am rethinking here. You say that the pedal is fading? I am starting to lean on the idea that the master may be bad. I had this happen on the DPB car that I sold to Brad Wells.

Brand new MC

Pedal is not fading, it's just mushy until I pump it 3 times

[Zack]

It's holding vacuum. I just pulled the check valve out after the car was off for 30 minutes.
It belched a bunch of air out

[ChiTownMaraud3r]

Probably still has air in it. Same thing was happening to my motorcycle. Kept bleeding it and improved.

[martyo]

It's holding vacuum. I just pulled the check valve out after the car was off for 30 minutes.
It belched a bunch of air out

Then it does not sound like the booster.

Probably still has air in it. Same thing was happening to my motorcycle. Kept bleeding it and improved.

That is my guess.

I would rebelled it.

Did you carefully bench bleed the master?

[John Nero]

change the brake fluid - brake fluid attracts water - had a crapping brake peddle - my shop replaced the fluid in the system and everything was great

[Zack]

I bled the hell out of the MC and I just flushed a gallon of fluid through all lined. I'm deleting the ABS

[8UWITH6]

If he did calipers and a master Im sure its got 100% new fluid in the system.

[ctrlraven]

Im curious as well cause I've changed all my brake components besides the abs unit and brake booster and I still have a low pedal. I get a firm pedal after a few quick pumps.

Are the bleeders valves at the top or bottom of the caliper? There was a thread years ago about the stock calipers could be mounted on the wrong side which would leave the bleeder vavle sitting on the top side and could cause air in the line.

[Zack]

Im curious as well cause I've changed all my brake components besides the abs unit and brake booster and I still have a low pedal. I get a firm pedal after a few quick pumps.

Are the bleeders valves at the top or bottom of the caliper? There was a thread years ago about the stock calipers could be mounted on the wrong side which would leave the bleeder vavle sitting on the top side and could cause air in the line.

Wut

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