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Chris
Chris, Shop Foreman
Category: Jeep
Satisfied Customers: 3293
Experience:  Jeep Certified Master Tech
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2003 jeep liberty brakes are full pedal till you start

Customer Question

2003 jeep liberty brakes are full pedal till you start engine then go to the floor. NEW pads all the way around new master cyl have been bleed 5 times includeing a gravity bleed
Submitted: 9 months ago.
Category: Jeep
Expert:  david craig replied 9 months ago.

Hi Im David, thanks for visiting the site. did you bench bleed the master cylinder before installing?

Customer: replied 9 months ago.
no
Expert:  david craig replied 9 months ago.

looks like their having issues with payment for the call?

Expert:  david craig replied 9 months ago.

have you tried bleeding the brakes with the car running?

Customer: replied 9 months ago.
no i have not bleed brakes with eng running
Expert:  david craig replied 9 months ago.

try bleeding the brakes with the engine running. believe me it has solved this problem many a time

Expert:  david craig replied 9 months ago.

regular manual bleed. person in drivers seat..etc..etc..

Customer: replied 9 months ago.
ok will due
Expert:  david craig replied 9 months ago.

let me know how it goes... next time you replace a master. just take some extra time and bench bleed it before installing. makes life a lot easier.

Customer: replied 9 months ago.
ok i will do that
Expert:  david craig replied 9 months ago.

any luck?

Expert:  david craig replied 9 months ago.

do you still need assistance?

Customer: replied 9 months ago.
didnt work need to talk again
Customer: replied 9 months ago.
I bled brakes today with engine running had same results spongy pedal
Expert:  david craig replied 9 months ago.

ok. you're sitting in the driver seat. you pump the brake pedal and it feels good. you start the vehicle and the pedal goes to the floor. during bleeding you had straight fluid. does it travel as far as it did before you bled them with a running engine?

Customer: replied 9 months ago.
same thing
Expert:  david craig replied 9 months ago.

ok, im gonna pull a schematic of the system.......

Expert:  david craig replied 9 months ago.

question, drums or rotors on the back?

Customer: replied 9 months ago.
its rotors on the back also .This may be irrelevant but all this started when a front rubber line started leaking replaced it and the spongy brake problem began
Expert:  david craig replied 9 months ago.

and you're bleeding from rr/rl/fr/fl right?

Customer: replied 9 months ago.
thats the way I have been bleeding them
Expert:  david craig replied 9 months ago.

sorry, had to ask

Expert:  david craig replied 9 months ago.

is the master cylinder a single bowl or double?

Customer: replied 9 months ago.
Its a single bowl
Expert:  david craig replied 9 months ago.

ok..........now as you are aware, at least here in the northeast, when a customer comes in with a rusted thru brake line, i recommend replacing all of them because 9 out of 10 times another line will rupture in the process of bleeding. what i am getting at is, check the condition of the remaining rubber hoses/lines. feel them if they are spongy or deteriorated. they can actually be swelling causing excessive travel.

Customer: replied 9 months ago.
Ok I should be able to see that while some one pumps the brake right
Expert:  david craig replied 9 months ago.

it is very difficult to determine, but if they are bad enough you should

Expert:  david craig replied 9 months ago.

another question when you replaced the m/c did you disconnect any lines going to the abs module?

Customer: replied 9 months ago.
No I only disconnected the two lines going into the master cylinder
Expert:  david craig replied 9 months ago.

ok. well if there is no noticeable/questionable other problems with the remaining rubber, all i can say is bleed them a few more times. i have had a few vehicle that it took a good 10-12 bleeds. i have no ides why either.

Expert:  david craig replied 9 months ago.

did you happen to pull the vacuum hose off of the booster to access the m/c???

Expert:  david craig replied 9 months ago.

calling it a night brother.........its almost midnight here.

Customer: replied 9 months ago.
Im probably at 12 or more now but i will bleed them again and check the rubber lines for flaws Ive been doing mechanic for a long time and never run into this giving me gray hair no vaccum lines off checked that today
Expert:  david craig replied 9 months ago.

what about the booster check valve?

Expert:  david craig replied 9 months ago.

was the m/c a reman or new?

Customer: replied 9 months ago.
It is a rebuilt
Expert:  david craig replied 9 months ago.

put a new one in.

Expert:  david craig replied 9 months ago.

oem

Customer: replied 9 months ago.
are the rebuilts not good
Expert:  david craig replied 9 months ago.

i run into bad remans alot

Customer: replied 9 months ago.
ok i will try that more expensive but if it works its worth it
Expert:  david craig replied 9 months ago.

ok...

Expert:  david craig replied 9 months ago.

any luck?

Expert:  david craig replied 8 months ago.

????

Expert:  david craig replied 8 months ago.

did you try a new one?

Expert:  Eric replied 8 months ago.

Hi,

Different expert here.

do you still need help?