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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Brake fluid reservoir cleaningViews : 487 Replies : 6Users Viewing This Thread : |
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Jun 19th, 2022, 10:16 | #1 |
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Brake fluid reservoir cleaning
Hi guys, I'm taking advantage of the weekend to do maintenance tasks on my 97 940 lpt. Renewing the brake fluid. Yesterday I vacuumed part of the brake reservoir, my surprise was that there is a part of the reservoir that does not come out vacuuming, I suppose it is the part that feeds the ABS. My question is, how do you get that fluid out of the brake reservoir? I suspect by pulling the reservoir up and dislodging it from the master cylinder. If so, should I bleed the master cylinder afterwards? This one has two purge nipples, how should I purge? Your answers will be appreciated
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Jun 19th, 2022, 23:47 | #2 | |
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Jun 20th, 2022, 12:42 | #3 |
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Thanks for your reply Laird. I have a power bledeer to bleed the system. I have not managed to separate the brake fluid reservoir from the MC, when you say bleed the entire system, do you also mean the MC?
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Jun 20th, 2022, 13:53 | #4 | |
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First, you shouldn't ever need to separate the reservoir from the master cylinder in normal service, only for repairs or replacement of the master cylinder. Second, by vacuuming it out, you have already introduced air into the entire brake system. As such, it will need bleeding in its entirity to ensure removal of all air and contaminated fluid from the system. When you say you have a power bleeder, what exactly do you mean? Certain types of these won't work particularly well with the Bosch ABS systems used on the 7/9xx ranges, particularly if they are the vacuum variety that apply vacuum to the bleed nipples. My advice to you now would be, firstly remove the brake light fuse and then top up the master cylinder and weddge the brake pedal down overnight. Remove the wedge next day, refit the brake light fuse and ensure the brake lights work again. Now, preferably using a Gunsons Easibleed, bleed the system starting with one rear wheel, then the next then move onto the front ideally in the same left-right or right-left order that you did the back end. Neither of the Bosch ABS systems will tolerate "live bleeding" so make sure the ignition key is out of the car. You may get away with it (or appear to) once or maybe even twice but you may also cause damage that will be unseen for some considerable time. Hope that makes things clearer!
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Jun 20th, 2022, 16:24 | #5 |
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First of all thank you very much for your answers, you are a source of wisdom for Volvo!
Forgive me if some of your indications I do not understand perfectly, since I use Google translate to read and write the answers. I have a power bledeer that wields pressure in the liquid reservoir. At the end of the message I attach a photo of my bleeder. -Remove the brake light fuse, it refers to the fuses behind the ashtray or disconnect the brake switch next to the pedal. -The wedge to press the brake all night means that you put weight on the pedal so that it stays down or that you put a wedge behind the pedal so that it does not make too much travel and risk breaking the lips of the master cylinder ? I hope you don't feel overwhelmed by my questions, just that as I said before Google translate sometimes translates like crap. Best regards! Last edited by Hebaristo; Jun 20th, 2022 at 16:49. |
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Jun 20th, 2022, 16:45 | #6 | |
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Something that makes me laugh about Google Translate is the people who use it to translate a meaningful expression into Chinese or Japanese and it displays a letter/word in one of those languages that actually says "Google Translate can not translate this" - they then have this letter or word tattoo'd on themselves.
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Jun 20th, 2022, 17:04 | #7 |
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Hahahahahaha.. Your example on Google translator is very good.
Completely clarified doubts. I hope you are doing well, thanks again! Cheers!! |
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