WannaVulture Posted August 22 Share Posted August 22 My 1994 E34 540i has a brake master cylinder that is experiencing a little leakage, causing a delay in passing the MOT inspection. Surprisingly, the brake master cylinder (part number 34311163924) is no longer available. The available alternatives seem to be limited to: Locate a pre-owned one (which has presented challenges) Reconstruct the current unit. Online, there are rebuild kits available from FRENKIT. Additionally, I have received assistance from a member of a US Forum who provided specific information on gasket and seal sizes. However, I am uncertain about the next steps to take. Are there any firms specialising in rebuilding vehicles in the UK? I just relocated here and am specifically looking for companies or forum users that have E34/E32 cars that are being dismantled and have relevant parts available. Thank you in advance! Link to comment Share on other sites More sharing options...
Bitxx Posted August 22 Share Posted August 22 Please attempt these tasks. https://www.pastparts.co.uk/ Link to comment Share on other sites More sharing options...
WannaVulture Posted August 22 Author Share Posted August 22 Thank you for the recommendation! I contacted them and they expressed optimism for a rebuild. However, they emphasised that they would want the physical presence of the unit in order to provide a conclusive response. Link to comment Share on other sites More sharing options...
Cleverco Posted August 22 Share Posted August 22 Consider using the services of either Big Red or Brake Engineering. Link to comment Share on other sites More sharing options...
SushySosa Posted August 22 Share Posted August 22 I would personally undertake the task of refurbishing it, since it is not a difficult endeavour. As said before, biggred may own the item or information that you want. Link to comment Share on other sites More sharing options...
SushySosa Posted August 22 Share Posted August 22 https://www.biggred.co.uk/catalogue/brm-master-cylinder-kits Link to comment Share on other sites More sharing options...
WannaVulture Posted August 22 Author Share Posted August 22 I appreciate the provided hyperlink. I was uncertain about the nature of Bigred, but it seems that I have purchased one of the final kits, with the expectation that it would be compatible. I would rather undertake the task of reconstructing myself, while I am aware that there is a possibility of making mistakes in the process. I have examined this website that discusses a comparable reconstruction: http://bmw8.us/Brake Booster Rebuild.htm Link to comment Share on other sites More sharing options...
WannaVulture Posted August 22 Author Share Posted August 22 The individual mentioned in the article explained the technique as follows: "To remove the bakelite bushing, a small hole is drilled near the rear end of the input shaft, allowing it to be pulled out using a wire hook." Detach the circlip and apply WD40. Additionally, there is a vertical pin located underneath one of the reservoir sockets that must be removed since it secures the pistons in place. Appears to be really overwhelming. It is exasperating to go through this process just to end up having to sell the 540. Link to comment Share on other sites More sharing options...
Bitxx Posted August 22 Share Posted August 22 Please inform us of the outcome and pricing. I am certain that others will find this information valuable. Link to comment Share on other sites More sharing options...
WannaVulture Posted August 22 Author Share Posted August 22 I will comply. They provided a rough estimate of about £200, which is more than the cost of a few seals/gaskets or a rebuild kit, but not too expensive. Link to comment Share on other sites More sharing options...
Bitxx Posted August 22 Share Posted August 22 Before purchasing a rebuild kit, it is advisable to disassemble the master cylinder and assess its suitability for rebuilding. If there are any marks or damage in the cylinder's bore, it is not salvageable. Link to comment Share on other sites More sharing options...
WannaVulture Posted August 22 Author Share Posted August 22 Although not ideal, purchasing a used OEM part is a more cost-effective option compared to buying a new one when they were still being produced. Additionally, it is preferable than owning a low mileage 540 that cannot pass the MOT or be sold. I am apprehensive about scoring and damaging any internal components, thus I am inclined to use PastParts. Link to comment Share on other sites More sharing options...
WannaVulture Posted August 22 Author Share Posted August 22 I appreciate the provided hyperlink. I was uncertain about the nature of Bigred, but it seems that I have purchased one of the remaining kits, with the expectation that it would be compatible. I would rather do the task of rebuilding my automobile myself, since I am used to performing most of the maintenance work on my vehicles. However, I am aware that there is a possibility of making mistakes and perhaps worsening the situation. I have examined this website that discusses a comparable reconstruction: http://bmw8.us/Brake Booster Rebuild.htm Link to comment Share on other sites More sharing options...
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