2004 Custom jerks when braking

[3echo9]

2004 Lesabre Custom, 200,860 miles

Looking for suggestions on why my Lesabre jerks to the left when applying the brakes.

This was my daughters daily. I didn't know it was doing this until she announced she had bought herself a new/used car. So I took the Lesabre for a drive and noticed a pretty serious pull to the left when braking. She claims she didn't notice it..ok. It also sounded like a box of rocks were rolling around in the trunk. That turned out to be a bad shock. I just replaced those today. Fixed.

A few years ago I replaced the calipers, 2018. Had the dealer flush the brakes and bleed the brake lines because the pedal felt soft. It didn't help much.

I did a visual inspection on all four wheels looking for any fluid leaks. The pads were noticeably worn more on the drivers side than on the passenger side. Removed both calipers and regreased the caliper pins. I decided to put a new master cylinder on and then bled them again. The jerk is less noticeable but still present. The pedal still feels soft to me but I'm used to driving a newer car.

The pads on the rear still look good but they don't look like they are engaging the rotor very much as there is a good amount of rust spotting on the rotor surfaces.

I haven't replaced any of the brake hydraulic lines.

Thanks, for the help.

[maxwedge]

Possible the right hand caliper is not applying fully, this can cause the pull to the left. Stuck sliders or a bad caliper are possibilities.

[3echo9]

Originally Posted by maxwedge

Possible the right hand caliper is not applying fully, this can cause the pull to the left. Stuck sliders or a bad caliper are possibilities.

I agree. It's almost as if the PS caliper is hanging up and allowing the DS caliper to engage alone, pulling the car to the left.

[Blue Bowtie]

A deteriorating brake hose can also hold and/or partially block brake fluid flow under light (normal) application of brakes. That can also create similar symptoms, but be sure the calipers are not hanging first.

[3echo9]

This is a follow up.

Finally, got around to changing the passenger side caliper. That did the trick!

Now to figure out why the pedal is still soft. Had a dealer blead the system with no change. I suspect the rear disc brakes are not engaging the rotors as they appear to have surface rust even after a heavy use.