Brake Pedal Requires Pumping to Stop
#1
Junior Member
Thread Starter
![Question](https://mbworld.org/forums/images/icons/icon5.gif)
Hey Everyone!
Quick thing, I recently went ahead and replaced my calipers due to them seizing. I went ahead and bled each line after installing the new ones as well. However, now the brake pedal requires multiple presses in order to attain full braking authority. Anyone have any tips? No lines were opened from the Master Cylinder to the ABS unit throughout this whole process either.....perhaps I need to rebleed the calipers again? Any help is appreciated!
Car is a 98' ML320, which I have heard have some funny business with brakes.....
Quick thing, I recently went ahead and replaced my calipers due to them seizing. I went ahead and bled each line after installing the new ones as well. However, now the brake pedal requires multiple presses in order to attain full braking authority. Anyone have any tips? No lines were opened from the Master Cylinder to the ABS unit throughout this whole process either.....perhaps I need to rebleed the calipers again? Any help is appreciated!
Car is a 98' ML320, which I have heard have some funny business with brakes.....
#2
MBWorld Fanatic!
Hey Everyone!
Quick thing, I recently went ahead and replaced my calipers due to them seizing. I went ahead and bled each line after installing the new ones as well. However, now the brake pedal requires multiple presses in order to attain full braking authority. Anyone have any tips? No lines were opened from the Master Cylinder to the ABS unit throughout this whole process either.....perhaps I need to rebleed the calipers again? Any help is appreciated!
Car is a 98' ML320, which I have heard have some funny business with brakes.....
Quick thing, I recently went ahead and replaced my calipers due to them seizing. I went ahead and bled each line after installing the new ones as well. However, now the brake pedal requires multiple presses in order to attain full braking authority. Anyone have any tips? No lines were opened from the Master Cylinder to the ABS unit throughout this whole process either.....perhaps I need to rebleed the calipers again? Any help is appreciated!
Car is a 98' ML320, which I have heard have some funny business with brakes.....
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
What procedure did you follow to bleed your brakes?
Did you follow this sequence?
![](https://cimg3.ibsrv.net/gimg/www.mbworld.org-vbulletin/700x414/screen_shot_2020_01_18_at_3_00_13_pm_6a8f4b4fcdf917fadc3c098463c67d3133a534c2.png)
#3
Junior Member
Thread Starter
I have heard that by nature brakes on the ML's tend to be a little on the softer side. So sometimes people tend to misdiagnose them due to that haha.
I bled the vehicle by cracking the drain hole on the calipers and siphoning it into a bottle with brake fluid in it. I did get air out of the system overall!
And yes! I did bleed them in that exact order!
However, the car requires multiple pumping to come to a full stop. Almost as if there is no pressure building up in it unless I continue pressing it repeatedly.
I bled the vehicle by cracking the drain hole on the calipers and siphoning it into a bottle with brake fluid in it. I did get air out of the system overall!
And yes! I did bleed them in that exact order!
However, the car requires multiple pumping to come to a full stop. Almost as if there is no pressure building up in it unless I continue pressing it repeatedly.
#4
MBWorld Fanatic!
I have heard that by nature brakes on the ML's tend to be a little on the softer side. So sometimes people tend to misdiagnose them due to that haha.
I bled the vehicle by cracking the drain hole on the calipers and siphoning it into a bottle with brake fluid in it. I did get air out of the system overall!
And yes! I did bleed them in that exact order!
However, the car requires multiple pumping to come to a full stop. Almost as if there is no pressure building up in it unless I continue pressing it repeatedly.
I bled the vehicle by cracking the drain hole on the calipers and siphoning it into a bottle with brake fluid in it. I did get air out of the system overall!
And yes! I did bleed them in that exact order!
However, the car requires multiple pumping to come to a full stop. Almost as if there is no pressure building up in it unless I continue pressing it repeatedly.
Yes, to one suv, with the brake hiss problem and resolved with a patch solution.
Check your brake lines for any expansion issues. Also check vacuum lines for any cracks, etc. going to the brake booster.
There's been a rash of similar soft pedal issue posts recently on this forum I think and the other. I recall reading thru them - do a search to see what possible resolution was posted on those.
here's one of many
#6
MBWorld Fanatic!
#7
Member
If not the system, can it be the calipers?
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#8
Member
Also I should add that the hiss went away when bleeding but when I began to drive it came back. And the hiss comes when I press the pedal down and not releasing.