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Old 07-24-2009, 08:58 AM   #1 (permalink)
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back up battery

what is the purpose of the small battery located under cabin filter regards bob.
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Old 07-24-2009, 10:28 AM   #2 (permalink)
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what is the purpose of the small battery located under cabin filter regards bob.
The main purpose is to be a backup power source for the SBC brakes. Pre-facelift W211 with SBC brakes comes with the AUX battery, a face lift W211 without SBC brakes comes with a single battery.

An R230 with SBC brakes comes with a main battery and "a bigger than W211 AUX battery", the starter battery at the engine bay.
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Old 07-24-2009, 11:32 AM   #3 (permalink)
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thanks for help(if i am working on brakes do i need to disconnect aux battery)regards bob
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Old 07-24-2009, 11:50 AM   #4 (permalink)
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thanks for help(if i am working on brakes do i need to disconnect aux battery)regards bob
Bob, you REALLY should search before asking questions here. Not being blunt, but with all of the information contained within this forum will tell you everything you need when it comes to working on the brakes on the W211 car.

There's a ton of information here, if only a search would bring it out.
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Old 07-24-2009, 05:20 PM   #5 (permalink)
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looking for a complete motorola bluetooth phone kit for my e55 2005.if
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Old 07-24-2009, 11:26 PM   #6 (permalink)
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Bob, you REALLY should search before asking questions here. Not being blunt, but with all of the information contained within this forum will tell you everything you need when it comes to working on the brakes on the W211 car.

There's a ton of information here, if only a search would bring it out.
Search should bring a lot of info but on servicing SBC brakes I would prefer anyone who does not know that SBC needs to be disabled before brakes are serviced, would ask first before loosing his/her fingers.

Search again brings instructions on how to disable SBC brakes.
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Old 07-25-2009, 01:59 PM   #7 (permalink)
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And, disabling SBC is not done by disconnecting battery. Doing so will create all kinds of problems.
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Old 07-25-2009, 04:13 PM   #8 (permalink)
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The main purpose is to be a backup power source for the SBC brakes.
The secondary purpose is to serve as yet another example of engineering for engineering's sake.
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