SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: 2003 sl 500 top hydraulic pump fluid

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Old 09-08-2020, 07:18 PM
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2003 SL500
2003 sl 500 top hydraulic pump fluid

I tried to add fluid to the covert hydraulic pump and could not get it to go into either hole. Am I doing something wrong?
Old 09-09-2020, 07:50 AM
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R230 SL500; previously 280CE and 180E.
The fill hole is closest to the front of the car and closest to the left fender. It requires a little pressure to get fluid in. I use a 10 ml plastic syringe with a thin plastic tube over the syringe nozzle and a rubber/plastic plug from a brake wheel cylinder fitted tightly over the plastic tube. (I drilled a hole through the plug first.) This fits snugly into the fill hole and allows hydraulic fluid to be forced into the pump reservoir. I have seen where others use a syringe with needle to get fluid into the reservoir. It takes a few refills of the syringe to fill the reservoir.
Old 09-09-2020, 07:54 AM
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R230 SL500; previously 280CE and 180E.
The plug I drilled a hole through was the rubber/plastic plug from a brake wheel cylinder, NOT the alloy plug that screws into the reservoir opening! Any similar plug will do, so long as it fits snugly into the reservoir fill hole and over the plastic tube.
Old 09-09-2020, 11:04 AM
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2005 R 230 SL350 (M112 3.7). Sold the 1966 W113 230SL recently
Open the other plug for venting purpose.
Old 09-10-2020, 10:20 AM
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2003 SL500
Originally Posted by Psnj
The plug I drilled a hole through was the rubber/plastic plug from a brake wheel cylinder, NOT the alloy plug that screws into the reservoir opening! Any similar plug will do, so long as it fits snugly into the reservoir fill hole and over the plastic tube.
Thank you! it worked like a charm

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