normspanners
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any wear is usually minute, rust/ corrosion is the bigger problem causing pits in pistons and cyl's coz of the hygroscopic effect of brake fluid holding water.
large medical syringes are your friend for that job suck out as much as poss from the res then get another to put a piece of rubbery washer pipe on the nipple and an assistant to keep the res topped up then suck it out of the wheel cyl or caliper BUT one at a time ! until fresh clean fluid emerges. Ok you might not get every drop out but as good as.
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It is usually very easy to spot when the new fluid comes through, just take some of the old fluid from the reservoir and compare it to new fluid to see the difference.Will the fresh clean fluid be obvious as in the old stuff that comes out first will be discoloured?
The only car I've had a problem with was a Porsche 964 C4S and that has an electric booster pump and ABS.Well that wont always work on some cars because of the configuration and flow of the pipe work to abs modules etc where the pipe go higher that the master cyl. pressure bleeding or the vacuum system usually does, if a pressure bleed is not available at the time required the system is allowed to fill by gravity as much as possible and the pressure 'shooting' method of bleeding is used where a pressure is achieved by pumping and held as high as poss then the bleed released as quickly as poss, to 'fire ' the fluid through hopefully taking with it the air or as much as poss of it, in each 'firing'
as zx9 says when old it is a brown colour like weak tea without milk and new is pretty clear.Will the fresh clean fluid be obvious as in the old stuff that comes out first will be discoloured?
as zx9 says when old it is a brown colour like weak tea without milk and new is pretty clear.