Hi, I have a 1990 Cherokee limited with ABS, Bendix 9.

What plugs into my power break booster here circled?

 

Normally, that the vacuum supply for the booster. That would be a check valve.

I thought ABS systems were pump driven, not vacuum.

An old thread (so please don't bump) but has a pic of the '90s ABS

https://www.cherokeeforum.com/f67/19...estion-180823/

 

Did you just acquire this? Do the brakes work?

 

The vacuum supply is plugged into the right side of the booster, this thing extends from the left side and has a two pin socket.
The brakes work but no ABS.
From all the pictures of XJ brake boosters ive seen I cannot find one with this connection thing.

 

I Googled a bit and came across a 1998-2007 Volvo brake booster setup. Looks like a match. That connector is for a brake pedal position switch.

 

@fb97xj1 Yes you're right, connects to brake position sensor. Thank you