I recently changed the front discs and calipers due to the driver's side sticking and making the disc red hot. So I changed both sides and it seems to be happening on the passenger side know. I have bled the lines and that did not work. When I step on the brakes it pulls hard to the right and will stick there. What can be the problem? My fiance just got this willed to her and we do not know much about the Mercedes.



1973 450SEL

The rubber brake line may be collapsed causing the caliper to stick/not release properly. Since the car is 31 years old it's probably time to replace the brake lines on all 4 calipers.

__________________
Fred Hoelzle

You'll probably need to get you calipers rebuilt. The pistons will tend to either stick or leak on a worn caliper.

Swollen brake lines can also give a similar but milder effect. Did to old pads wear diferently (noticably) on each side of the same caliper? if they did then you'll definately need a caliper overhaul

__________________
Alex.

MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32

Cddaily, your original post may have caused some confusion. You mentioned that you replaced the front discs and calipers. Did you actually replace the calipers or simply the front discs and brake pads?

__________________
Fred Hoelzle

I replaced the discs, calipers and pads completely. I have ordered new brake lines and will try that. Where online is the best place to get parts, quick realiable and not bad priced? I bought all the brake parts at *************** .

You could try here: http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=mercedesshop&cookieid=1AM13H66E&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1973&product=N7000-16092&application=000015161

__________________
2007 C 230 Sport.

Cddaily, check prices at thebenzbin.com

__________________
Fred Hoelzle

Brake hoses are definitely shot, replace them all. I've seen this several times -- the hose lining goes bad and a flap forms that acts as a one-way valve. YOu apply the brakes and they stay on, forever or until you open the bleeder, when they nicely release.

New hose will fix it.

Flush all the fluid out of the rears, too, and I'd plan on a caliper rebuild back there, too, they will stick eventually from old hard piston seals.

You should know that MB rotors are disposable -- usually need to be replaced every third set of pads or so, cannot be turned. They are not expensive. Easy to check -- if there is a distinct lip on the edge of the rotor where the pads don't cover, replace the rotor, it's undersized.

If you let the rotors get too thin, the backing plate on the pad will contact the anti-rattle spring, the pistons will get cocked, stick, overheat the pads, and roast all the rubber parts in the calipers. Avoid the hassle by replacing the rotors as necessry.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Click the Buy Parts Button at the top of your screen for great prices from Partsman Phil.

__________________
Brandon



2008 S550
1957 Dodge D100
1967 VW Microbus 21 Window
2001 Suburban
2004 Beach cruiser bicycle
-----------------GO DUKE!-----------------

"It cannot be emphasized too strongly or too often that this great nation was founded not by religionists, but by Christians; not on religion, but on the Gospel of Jesus Christ. For that reason alone, people of other faiths have been afforded freedom of worship here." Patrick Henry 1776

I replaced the lines and all is well, need to work on the rear brakes next. No problem with them just need to rebuild them

thanks all