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Old 06-15-2005, 07:11 PM
Posts: n/a
Bleeding brakes, but no pressure

Hi Everyone,

I removed, cleaned and re-installed the brake fluid
resevoir on my 88 300e and refilled it with dot 4.
I then had my father pump the pedal to build
pressure and bled the right rear caliper. All the time,
being careful not to let any air in the system.

But when I tried to bleed the left rear, all I got was a mixture of
bubbles and fluid. I continued to bleed it, but now
I'm not getting anything. Not fluid. Not air.

I can't seen to get any pressure in the system. I've
tried running the vehicle for a minute or two but I still
have no pressure. The pedal stays spongy.

I've tried a gravity bleed, (10 minutes ) but not a drop.

Am I doing something wrong?

I've done a search on this and nothing seems to
apply. Any insight would be appreciated.


Last edited by bluebenz; 06-15-2005 at 07:12 PM. Reason: spelling mistake
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Old 06-15-2005, 07:27 PM
Registered User
Join Date: Jan 2001
Location: California
Posts: 2,068
You need to fill up the fluid reservoir such that the rear compartment is filled.
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Old 06-15-2005, 09:26 PM
Posts: n/a
Resevoir is full to the top. I've been letting it gravity
bleed for the last hour and not a drop. The "!" light is on
but the resevoir is full.

Pedal is mushy.

What gives?
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Old 06-15-2005, 09:39 PM
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Join Date: Jul 2003
Location: Ocean Isle Beach, NC
Posts: 2,527
Reservoir has two compartments. Front compartment feeds the rear brakes. The reservoir may look full, but the fluid has to overflow into the other half to fill the other compartment.

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Old 06-15-2005, 09:44 PM
Posts: n/a
They're both full.
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Old 06-15-2005, 11:04 PM
Registered User
Join Date: Mar 2003
Location: Southern California
Posts: 2,281
The rear res. if VERY DIFFICULT TO SEE. Look at the inside rear corner of the res. You should see the divider and the two levels.

The rear res. is also difficult to fill. You need to fill to near the top of the opening, then rock the res. back and forth and watch the inside rear corner to see that the rear res. fills.

This is a common problem that guys have with these cars. You THINK the res. is full, including the rear, but it's not! Then you bleed the rear res. dry and nothing happens when you try to bleed the rear brakes even though the res looks full.

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Old 06-16-2005, 01:44 AM
glenmore's Avatar
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Join Date: Sep 2002
Location: Los Angeles
Posts: 963
Been there, done that. Make sure you are parked on level ground or nose up.

1991 300CE
2000 C280
1990 LS400
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Old 06-16-2005, 10:11 AM
Posts: n/a
Okay guys. I can tell you for sure that the resevoir is full.
And the problem was a pin hole in the rear brake line. It was dripping
onto the skid guard and I could not notice it right away.

But thanks for eveyones help anyways.
It is appreciated.

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Old 06-16-2005, 12:18 PM
Join Date: Jun 2005
Location: Richmond, Va
Posts: 73
Bleeding Brakes

For about $30, I made a power bleeder out of small agricultural pressure sprayer. You can purchase a factory made unit for $50-$60. When need to bleed your systen again this really saves time.

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