Have a Car Question? Ask a Mechanic Online.
Without feeling the brakes this may be hard to resolve. Please answer my questions as accurately as you can.
How did the brake pedal feel before it went to the floor?
Was the master cylinder empty when you took it to the first shop?
Does this vehicle have ABS? (anti lock brake system)
Now do a test for me. Start the engine and leave it in Park. Push the brake pedal down and hold it for a few seconds. (note where the pedal is) Now pump the pedal 2 or 3 times and hold it again and see if it is in a higher position. Keep pressure on the pedal and see if it fads and starts to go lower to the floor.
Do this a few times and let me know the results. I can't promise to pin-point this but I will try to get you in the right direction. Fixing cars in today's day and age is hard enough but doing it on the pc is a real challenge.
I will do my best. Gunny44
Thanks for quick reply.
I just realized my car left in parking lot.
Will have to retrieve it and
will do the test suggested and advise.
Thanks for your patience.
Whenever. No rush on my end. I'll be on and off during the day. Lot's of yard work to do before the winter.
I was on way out of town when I got your reply and couldn't follow up as I also didn't have car at home.
Just got home and a.) I am answering your questions and providing results of the test you requested.to be performed.
1. How did brake feel before it went to floor. ? Soft ! But brakes never actually went
to floor, but felt like it was about to go to floor.
2.. Master Cylinder was not empty when I first took car to shop.
3. Vehicle has ABS (anti brake lock system ).
4. Brake Test:
a. Started engine in Park position.
Pushed brake pedal down and it went to about 2" above floor from
height of 6" above floor.
Pumped brake pedal 2-3 times and pedal came up to a higher position,
kept pressure on pedal and it settled to about 3" ABOVE FLOOR
KEPT PRESSURE ON PEDAL AND IT HELD AT 2.5" OFF THE FLOOR
B I repeated Brake test above a couple more times and got the same result.
Pardon the late response.
Look forward to your reply.
From your description I'm not so sure the master cylinder was the problem because this problem basicly still exits. I would be more apt to look for frozen caliper pistons, frozen caliper slide pins, worn out rotors and brake pads. The brake proportioning valve could also be stuck causing only front or rear brake action. Bleeding the system with the engine running often frees this valve. (the hint here is that the other shop wanted to test brake pressure leading me to think that they couldn't get a decent squirt of fluid out of either the front or rear bleeders)(maybe this machine exists but I never saw one nor had use for it).
For your safety and your family I would strongly suggest that this Trooper's brake system be totally checked. I know my answer to your question is of general nature but without being there I can't be sure of your problem and I will not guess on a saftey issue.
I don't expect you to accept since I didn't answer you completely. If you wish get back to me and I will opt out and see if another expert would care to tackle this.
Regards. Gunny44 Good luck. Get back to me if you have any more questions on this.
Following I have the proper brake bleeding procedure for you in case you want to try bleeding again. It's worth a shot.
BLEEDING BRAKE HYDRAULIC SYSTEM A bleeding operation is necessary to remove air from the hydraulic brake system whenever air is introduced into the hydraulic system. It may be necessary to bleed the hydraulic system at all four brakes if air has been introduced through a low fluid level or by disconnecting brake pipes at the master cylinder. If a brake pipe is disconnected at one wheel, only that wheel cylinder/caliper needs to be bled. If the pipes are disconnected at any fitting located between the master cylinder and brakes, then the brake system served by the disconnected pipe must be bled.
Me again Henryj999
Just an after thought. You said the brake pedal was soft even before it went to the floor.
Has the master cylinder ever been very low and you added fluid? If this is the case then I would go for air in the lines and rebleed several times. That was the reason for my original questions to see if the pedal reacted as though air was trapped in them.
Still thinking. Gunny44
Hi Gunny 44!
Thanks for your help.
This brake stuff has made me a bit nervous, so Isuzu referred me
to one of their last dealer facilities and I left Trooper with them.
You certainly responded in a professional manner.
Thank you for the accept and compliment.
Only wish I could have said "Ah Ha" there's your problem!
You are doing the right thing and if you have any questions with this Isuzu dealer's diagnose get back to me and I'll try and explain it to you.
Regards XXXXX XXXXX it's not that big of a repair.