Is a spongey pedal common/normal in CE Lancers? - Mitsubishi-Forums.com
 
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post #1 of 5 (permalink) Old 02-04-2017, 08:09 PM Thread Starter
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Is a spongey pedal common/normal in CE Lancers?

Five years ago my daughter was given a damaged and poorly-maintained Lancer CE coupe. I repaired, serviced and registered it and she's been using it since. In all that time I have been unhappy with the brakes, although they were usable and apparently good enough to pass a roadworthy test for rego.
I would dearly love to improve their performance.
Relevant service history and observations:
1. Rear brake linings 3mm...well within limits (1mm by my Gregory's manual). Adjusted as closely as possible.
2. Cylinders not leaking, not seized.
3. New front pads, pistons operating normally.
4. Fresh brake fluid, gravity-bled.
5. Booster getting good vacuum.
Symptoms:
1. Engine off... good pedal height.
2. Start engine, holding pedal... pedal drops virtually to floor.
3. Engine idling, pump pedal... no improvement in pedal height.
4. While mobile, braking is even and reasonably effective, but spongey and very low pedal, and bottom out with firm application. I wouldn't trust them in an emergency stop. There's little in reserve.
My question to all you CE owners is "is this a common or even normal characteristic, or am I looking at a brake booster problem?"
Hoping there are still a few CEs running around out there.
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post #2 of 5 (permalink) Old 02-04-2017, 08:46 PM
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do the booster test

how to test the brake booster
http://www.roadkillcustoms.com/hot-r...#axzz4Xlrdr9H8

if there is a problem replace the booster and check valve

if pedal is still going to the floor
the brake master cylinder may be bypassing internally
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post #3 of 5 (permalink) Old 02-04-2017, 09:35 PM Thread Starter
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Thanks for the response chain rattle.
Did the tests in the link. Scored two out of three possible successes... holding pedal and turning off engine failed - pedal right down when engine running so no change to indicate booster function when engine is turned off. Is that terminal?
Check valve test... no flow when blowing, very little flow when sucking - feels only that vacuum hose may be collapsing a little. Is "a little" significant?
My other confusion is that I can't see a check valve in line - the hose just disappears into the booster body.
Regards,
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post #4 of 5 (permalink) Old 02-05-2017, 02:50 AM
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if the brake pedal goes to the floor does the brake fail light come on

the pedal must be firm and higher ... not be on the floor at any time

would say the check valve tests ok

booster has to pass all three tests

brake master cyl may be bypassing

to test this while the pedal is held down
slacken off one pipe at a time at the brake master
see it the fluid has pressure at both pipe joins
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Last edited by chain rattle; 02-05-2017 at 03:01 AM.
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post #5 of 5 (permalink) Old 02-07-2017, 10:56 PM
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I would suspect the master cylinder.

The booster only helps braking - if not functioning you really have to press brake pedal with a lot of force.

Pedal goes to floor - address the problem immediately.

Before you change the master cylinder - double check no air in system.

I do not know what you mean with gravity bled - I always pump the air out.
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