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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBrake fluid change
Leading reported evidence
Replace disc pads etc and thought i'd better
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1
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Suggestion · Original poster
I'm going to be changing disc pads etc and thought I'd better to fluid change as it's not been done in the time I've had the car.
Leading evidence: 'Replace disc pads etc and thought i'd better' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace disc pads etc and thought i'd better' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
if you bleed the brakes only at the calipers you will have changed over 90 % of the fluid in the system ..
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Suggestion
I proved that when changing racing blue fluid to standard ..
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3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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I'm going to be changing disc pads etc and thought I'd better to fluid change as it's not been done in the time I've had the car.
I've got all bleed nipples moving so all good. My query is with the clutch, do I need to bleed the clutch or I can just leave this alone and do the calipers.
Official answer .. you bleed the clutch at the slave cylinder .. its a pain to do .
Un official answer and we need to break it down a bit .. long post coming up i feel ..
Moisture in the braking system .. water .. it boils at 100 degrees C .. calipers can often exceed this temp when used in a sporting manner.
Water boiling creates gas .. gas is compressible unlike brake fluid .. you put your foot on the brakes with air in the system and you will have a long pedal travel or it will goto the floor ..
Happened to me once many .. many years ago and i was too young and stupid to release the brake pedal and re apply it .. end result was i ended up on the main roundabout on the M1 shaking like a leaf still with my foot on the brake pedal ( on the floor ) .
brake fluid will absorb moisture over time .. porsche say change it every 2 years .. you can go longer but you need to remember these are sports cars not citroens .. a family saloon can go many years with no need for a replacement as the system never gets that hot .
Anyways .. if you bleed the brakes only at the calipers you will have changed over 90 % of the fluid in the system ..
If you don't bleed the clutch then it's a small amount left .. as the entire system is mixed then any moisture left will dissipate into the rest of the fluid .
You also need to remember that the clutch system doesn't get as hot as the braking system so the chances of boiling are negligible .
It also doesn't matter as the failure due to boiling on the clutch side means you have no clutch for one pedal depress .
One last thing to think of .. bleeding and starting at the n/s/r wheel .. if you don't take out 0.5 ltr then the old fluid is still in the pipes .. unless you drain out the reservoir first .
I proved that when changing racing blue fluid to standard .. i measured the amount that came out and it was 0.5 ..
Interestingly .. when i drained from the inner nipple .. NO blue fluid came out .. that would indicate bleeding at both nipples is Not warranted .
I'll just add .. i can feel the difference when i do a 2 year brake fluid change .. its not huge but i can tell the difference .
