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Brake Fluid
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RogerB



Joined: 18 Dec 2014
Posts: 172
Location: Suffolk Coastal. U.K.

PostPosted: Fri Jan 25, 2019 6:02 pm    Post subject: Brake Fluid Reply with quote

I have to renew the brake fluid in my Standard 8 clutch and brake system as the current fluid is over 5 years old....

The question is- can I use any 4 DOT fluid as a replacement? Or, is it advisable to use a specific classic car brake fluid product?

RogerB
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Bitumen Boy



Joined: 26 Jan 2012
Posts: 1251
Location: Above the snow line in old Monmouthshire

PostPosted: Fri Jan 25, 2019 11:10 pm    Post subject: Reply with quote

Any DOT 3 or DOT 4 fluid will be fine for this job. Probably someone does market a "classic specific" fluid, but it will be no more than a fancy bottle - the contents will be the same as the stuff you'd pick up in Halfrauds or a local factors.
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RogerB



Joined: 18 Dec 2014
Posts: 172
Location: Suffolk Coastal. U.K.

PostPosted: Sat Jan 26, 2019 6:02 pm    Post subject: Brake Fluid Reply with quote

Many thanks for your advice; I just love the spelling of Halfords......!

What is the difference between 3DOT and 4DOT?

Rogerb
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Bitumen Boy



Joined: 26 Jan 2012
Posts: 1251
Location: Above the snow line in old Monmouthshire

PostPosted: Sat Jan 26, 2019 6:26 pm    Post subject: Reply with quote

Essentially DOT 4 is an improved version of DOT 3 - the main difference IIRC is it has a higher boiling point, not really an issue for clutch hydraulics anyway. The two specifications are compatible and may be mixed safely.
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RogerB



Joined: 18 Dec 2014
Posts: 172
Location: Suffolk Coastal. U.K.

PostPosted: Sat Jan 26, 2019 10:30 pm    Post subject: Reply with quote

Thank you.....
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RogerB



Joined: 18 Dec 2014
Posts: 172
Location: Suffolk Coastal. U.K.

PostPosted: Sun Jan 27, 2019 2:33 pm    Post subject: Reply with quote

As I have to renew the brake (+clutch) fluid because of the age of the existing
fluid, I have to drain the existing fluid out of the brake pipes; that is easy!

What is the best way to refill the system with the new fluid bearing in mind that the system has to be 'bled' also?

RogerB
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alanb



Joined: 10 Sep 2012
Posts: 314
Location: Berkshire.

PostPosted: Sun Jan 27, 2019 6:26 pm    Post subject: Reply with quote

Roger, you don't need to drain the system you bleed them as normal but keep topping up and keep going until you get clean new fluid coming through, I use a bleed easy kit from Halfords when doing mine, so easy. When doing the brakes I was always taught to start with the wheel furthest away from the master cylinder in your case rear nearside then rear of side, front nearside, front of side. Good luck.
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RogerB



Joined: 18 Dec 2014
Posts: 172
Location: Suffolk Coastal. U.K.

PostPosted: Sun Jan 27, 2019 9:38 pm    Post subject: Reply with quote

Thank you....

That I will try asap.

RogerB
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