[W126 Coupe] Re: BRAKE DRAG

[J Hirsch]

 
Question:  what is the difference between  Euro 560 and US 560 besides 
the plusher interior on US cars?
Jay Hirsch   1990 560 SEC
nothing "personal' but the US shipped cars in particular the  last two 
years  1990/91 had great leather interiors
On Jan 27, 2006, at 10:05 AM, Dick Spellman wrote:

> Hi Dan:
>
> Not sure if you are describing the minor movement of the pads in their 
> caliper holders when you put the car in reverse for a period of time 
> like backing out the driveway but, this would be considered normal.  
> I've had that same brief thunk from the brakes on many of the 126 B's. 
>  As for the brake drag there is a test you could easily perform.  
> Start with just the passenger front wheel and when the car is cold 
> give it a spin by hand to get a feel for how much drag you have on 
> this one wheel.  It should spin freely and stop after several 
> revolutions.  Now take the car for a spin for 30 minutes or so of 
> normal driving and repeat the above test.  Is the wheel harder to 
> turn?  Does it spin the same number of rev's before coming to a stop?  
> If the wheel is in fact harder to turn after being heated up, I would 
> suspect that the brake lines are in fact swelling inside creating 
> added pressure on the caliper pistons.  Each caliper should also be 
> checked for wearing the inner and outer pads/rotors evenly.  If this 
> is not the case then you may need a rebuilt caliper or two.  Do you 
> replenish the brake fluid every year or so to get the sludge and 
> moisture out of the system?  Last question, have the front wheel 
> bearings ever been checked for run out when servicing the brake 
> rotors?  Have these wheel bearings been replaced recently by a shop?  
> This would be another point where if not properly adjusted you could 
> see an increase in drag.
>
> By the way, I have on different 126's replaced a frozen caliper, wheel 
> bearings , the caliper rubber brake lines and so on where I have 
> experienced all of these failures and done the diagnosis to repair 
> only what was needed.  I think you can do the detective work and 
> quickly isolate the problem you describe.
>
> Last comment you are one lucky guy to have a euro 560.  Are you in the 
> U.S?
>
> Dick
>
> Dan Gardner wrote:
>
>> Ever since I have owned my SEC it has had a "thump" on the brake 
>> pedal the first time they are used ,like leaving the garage and going 
>> down the drive,it does not happen at any other time.
>> Also there is a high amount of drag as the car will not roll on a 
>> slight incline,whereas my 450SL will freely roll away down the same 
>> stretch of road.
>>
>> After a trip of 30 mins all four wheels are warm to touch about the 
>> same amount,is this a symptom of the ABS.
>>
>>    Any thoughts most welcome           Kind Regards  Dan Gardner   
>> 560SEC EURO  1986  (220kw)
>>
>>
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