Brake Booster

[Fless]

Is it normal for the reservoir to balloon like that?

Edit: I guess it's just moving with the brake pedal action. Moves up a little.

 

[96-2D-Hoe]

Is it normal for the reservoir to balloon like that?

Edit: I guess it's just moving with the brake pedal action. Moves up a little.

I was asking about the air noise.

 

[George B]

I have heard booster woosh like that before and work fine but the brakes dragging is a concern. I would check the push rod on the master cylinder side to be sure it is the same length as the old one.

 

[PG01]

That booster is bad, the diaphragm inside maybe bad but that’s air escaping and it’s not letting the pedal come back up.... imo anyway

 

[Fless]

Have you monitored the engine vacuum to see what it does when the brake pedal is pressed?

 

[96-2D-Hoe]

Have you monitored the engine vacuum to see what it does when the brake pedal is pressed?

I haven't, but I'm pretty sure something isn't right from how it fires up roaring right now.

 

[96-2D-Hoe]

Part of what has confused me is whether the booster should be making as much air noise as it is. I'm really not sure if I just noticed it because I was paying attention to the booster, and had just never noticed how loud it is before.

The Cardone feels nicer to my foot, but the brakes holding on isn't right. The SKP had a different feel, but it worked and was just making the same air noise, that I'm now thinking is possibly normal as it's less likely I got two bad parts in a row.

Is why my OP basically asks 'did I just notice this'?

 

[96-2D-Hoe]

I've gone over everything again, made sure I didn't kink a hose, made sure the brake pedal is free to travel. The sticky pedal must be a bad booster, but I should probably/might just put the old one back on tomorrow to see what happens and then go from there.

 

[96-2D-Hoe]

Edit: I guess it's just moving with the brake pedal action. Moves up a little.

I think the booster and the MC bolts were still loosened off a little at that point as I was trying to see if there was any difference in the pedal return.

 

[96-2D-Hoe]

Someone kindly checked their vehicles and the noise is normal. Really not sure why that was so difficult to determine.

Thanks to everyone that replied.

 

[StatutoryAPE]

Someone kindly checked their vehicles and the noise is normal. Really not sure why that was so difficult to determine.

Thanks to everyone that replied.

I just experienced this today. Mine sounded worse though and I could physically see the booster expanding as the pedal is pressed and find that the air is escaping from the crimped spots on the flange. This is the second reman. booster I've had replaced within the last 10k miles, the first one locked up right when I left the shops parking lot. Anyways today I brought my Tahoe back to brakes plus who did the first two as it's under warranty still and they told me that the booster crimps are failing and they could eventually break and I wouldnt have power assist brakes anymore. So they're replacing it free of charge including labor. The shop manager remembered me from last year. He told me these remanned parts are all hit or miss unfortunately. Either way it's very strange, I've never heard a car l vehicle do this. If I were you I'd have a mechanic you trust take a look at it just to be safe.

 

[exp500]

I agree about checking length of pushrod, some are adjustable. Or you could even have a combination of mismatched parts. This is really beating you up.