Close

What is wrong and what is the fix, sometimes when Im braking the pedal gets hard on 1998 GMC Jimmy

also makes a hydraulic noise and the brakes dont work, when you push really hard they will work again

Check vacuum at brake booster if ok have booster replaced.
I agree with wetry
I agree with goodguy.
If I pull the abs fuse the brakes work fine, would it still be the brake booster?
You didn't mention the ABS light was on! Have the system scanned, lots of sensors, the module, valves ect. it could be.
There will be codes if you put the fuse back and drive it then scan. Or leave the fuse out but you will no longer
have anti lock brakes. Most common problem is wheel speed sensor(s) or connections. But not the only one.
Qualified Local GMC Shops
Qualified GMC Shops For This Repair
921 N Parker St
Orange
RepairPal Shop Scorecard
95
Technical Ability
93
Tools & Equipment
92
Customer Service
96
Customer Amenities
Group
CLOSED NOW
(714) 486-0367
1 more answer , 2 more comments
sounds like power brake booster is bad
where is the brake booster located?
It is the big black round thing behind the master cylinder. Suggest towing to repair shop!
I agree with everybody.