Sounds like a compressor kicking on

[10ga]

I keep hearing what sounds like a compressor kicking on ever once in a while, mostly after I get on my brakes hard. Also notice when I hit the brakes they feel soft until I pump them once. Any ideas what this could be? Also noticed while I'm sitting at idle it kicks on about every minute

 

[DirtDawg]

Sounds like your brake pump. If it is loud and weak, it could be on its way out.

 

[jLB]

Brake booster pump?

 

[10ga]

Are those hard to change out?

 

[Clunky]

Search "double pump" and "brake pedal height" and you'll find a lot of info.

IIRC, adjusting the brake pedal height has solved the double pump for some people, but there are various opinions on the risk/reward of that approach.

I've been told the pump sound is normal operation, but that probably depends on the actual sound.

 

[10ga]

This almost sounds like a small jackhammer or hammer drill drilling into concrete block. You can feel the vibration in the brake pedal. I have another 98 100 series and it's never done that.

 

[10ga]

They're pretty damn proud of those pumps.

 

[re_guderian]

They're pretty damn proud of those pumps.

 

[DirtDawg]

They're pretty damn proud of those pumps.

Yup. Go pull a good one out of a wrecked 4th gen T4R and replace. I think they also put the same pump in a lot of different models at the time.

 

[10ga]

About scared to get a used one. Apparently it's a pretty common problem. This is my 4th 100 series and Ive never had a problem before.

 

[DirtDawg]

I don't think it's as common as it appears to be... I would trust a lower mileage used pump.