tim hunt Posted May 10, 2022 Report Share Posted May 10, 2022 I am sure I am not alone in being plagued by apparent corrosion between the brake and clutch master cylinder bodies and their caps, which requires cleaning off at regular intervals. This brown mess looks like rust but of course cannot be since the cylinders and caps are an aluminium alloy of some sort. Some time ago I sourced a plastic replacement cap for the clutch m/c, as below, but so far have been unable to find anything similar for the brake m/c. I need a cap with an internal thread diameter of 62.5mm. Has anyone ever found such an item and if so could they please point me to a source. Tim Quote Link to post Share on other sites
boxofbits Posted May 10, 2022 Report Share Posted May 10, 2022 (edited) This product ‘might’ be what you’re looking for Tim. Looks like it was made available in 2020, and has an ID of 65mm. It has similar de-bossed decals on the cap to the original, but made of polypropylene. At £4.95 from Amazon it might well be on your doormat by the crack of dawn, delivery free! https://www.amazon.co.uk/Upgrade-Motorsport-GIRLING-Brake-Reservoir/dp/B08P3MMXVV Kevin Edited May 10, 2022 by boxofbits Quote Link to post Share on other sites
ianc Posted May 11, 2022 Report Share Posted May 11, 2022 I have been using plastic caps for some years and posted on this some while ago, so a Search might find the info. I purchased from competitionsupplies.com 64474602 for brake, 74470144 for clutch. Warning: if brake master cylinder is not Girling, the thread diameter may be of a different diameter, and plastic cap may be too large - check the info about thread diameter on the website of competitionsupplies. Ian Cornish Quote Link to post Share on other sites
tim hunt Posted May 11, 2022 Author Report Share Posted May 11, 2022 18 hours ago, boxofbits said: This product ‘might’ be what you’re looking for Tim. Looks like it was made available in 2020, and has an ID of 65mm. It has similar de-bossed decals on the cap to the original, but made of polypropylene. At £4.95 from Amazon it might well be on your doormat by the crack of dawn, delivery free! https://www.amazon.co.uk/Upgrade-Motorsport-GIRLING-Brake-Reservoir/dp/B08P3MMXVV Kevin Thanks for the lead Kevin - looks promising. I have messaged the seller asking if the cap is a direct replacement for and with the same thread as the Girling alloy cap part number 510844. Tim Quote Link to post Share on other sites
tim hunt Posted May 14, 2022 Author Report Share Posted May 14, 2022 On 5/10/2022 at 7:23 PM, boxofbits said: This product ‘might’ be what you’re looking for Tim. Looks like it was made available in 2020, and has an ID of 65mm. It has similar de-bossed decals on the cap to the original, but made of polypropylene. At £4.95 from Amazon it might well be on your doormat by the crack of dawn, delivery free! https://www.amazon.co.uk/Upgrade-Motorsport-GIRLING-Brake-Reservoir/dp/B08P3MMXVV Kevin Quote Link to post Share on other sites
tim hunt Posted May 14, 2022 Author Report Share Posted May 14, 2022 Thanks again Kevin. I ordered this cap from Upgrade Motorsport and it fitted. Hopefully my days of forever cleaning the rust coloured mess off the brake m/c and cap are now over! Tim Quote Link to post Share on other sites
boxofbits Posted May 14, 2022 Report Share Posted May 14, 2022 7 hours ago, tim hunt said: Thanks again Kevin. I ordered this cap from Upgrade Motorsport and it fitted. Hopefully my days of forever cleaning the rust coloured mess off the brake m/c and cap are now over! Tim Brilliant Tim, glad it sorted the issue. Regards Kevin Quote Link to post Share on other sites
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