low brake pedal

silverstar

New member
I have a 02 sprinter with a low brake pedal. thought it was air bled system. no change. replaced master cyl. and bled 3 times and even used scanner to activgat hyd. pump no change has anybody run in to this?
 

abittenbinder

Doktor A (864-623-9110)
I have a 02 sprinter with a low brake pedal. thought it was air bled system. no change. replaced master cyl. and bled 3 times and even used scanner to activgat hyd. pump no change has anybody run in to this?
Here is a reprint of one of my previous posts. Hopefully it will help you in your diagnosis:


"I receive a lot of mail and phone calls on the subject of ('02-'06)
Sprinter brake pedal feel, especially a perceived "abnormal sinking
pedal".

Many first time Sprinter owners or those who drive other vehicles
(more often than their Sprinters) are alarmed by a brake pedal feel
that they are convinced is abnormal.

Here's how to tell if your Sprinter brake pedal action is "normal" OR
in need of immediate service attention:

Engine running, push lightly on the brake pedal. Mushy and sinking
seemingly endlessly toward floor? This may be NORMAL.

Engage Park and handbrake. Shut off the engine and then step on brake
pedal 4 or 5 times. This releases the vacuum from the booster servo
and reservoir-you should hear a loud hiss when pressing pedal each
time until the vacuum is expended.

Engine still OFF, ALL vacuum expended, now step on brake pedal and
exert a steady force. Pedal should move a relatively short distance
(compared to before) and stop hard without further sinking- REGARDLESS
of how long you exert foot pressure. This is the TRUE test of the
brake master cylinder. If pedal slowly sinks to floor during this
test- you have a problem.

Now step on pedal again and exert steady pressure while starting
engine. With engine now running- the pedal should begin sinking
steadily toward floor. This is NORMAL and indicates the engine's
vacuum pump and the brake servo are working properly.

Take foot off the brake pedal and run the engine for a few seconds at
1500 rpm to build vacuum. Go back to idle speed, step on the brake
pedal slowly-see the difference and the much greater sink distance
compared to engine "off" and vacuum released?

Still convinced it's excessive pedal travel? Try this test-Engine
running, move Sprinter to a downward sloping driveway, place in
neutral and SLOWLY creep down hill. Gently apply brake pedal pressure
and note how little pedal travel is needed to stop and hold the
vehicle-now push harder-see how much pedal travel remains?

This long, soft, pedal travel is a normal characteristic of the
Sprinters vacuum booster design when engine is running." Doktor A
 

silverstar

New member
O.K SORRY GUY'S I didn't check everyrthing like I thought I did, it turns out to be frozen caliper pins in the rear. thanks for the replies. hope this helpls someone in the future.
 

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