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Hi Guys
Are you able to clarify which brake fluid to use on a HJ 308.
The HJ Owner manual says GM 4653M Type 450, which looks to be equivalent to Dot 3.
The Ellery manual says GM - HN 1796, which looks to be equivalent to Dot 4.
Thanks,
Conor
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I'd be taking notice of the GMH Owner Manual, but I don't think it really matters as both are Glycol if I remember correctly. Dot4 is just higher boiling point. I don't think you want to mix Dot3/Dot4 and Dot5 though, it can make a sticky mess. Edited by user Saturday, 22 October 2022 5:29:17 PM(UTC)
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I'm a big proponent of using Dot3 in older cars.
The 3 main differences between Dot3 & Dot4 is firstly that Dot4 has a higher boiling point as HK1837 has said.
The second difference is that Dot4 is even more hygroscopic (moisture absorbing) than Dot3 & has to be changed more often.
The third difference is that Dot 4 is thinner (less viscous) than Dot3, this is to allow better flow in modern ABS valving.
So unless you really need that higher boiling point you are far better off using Dot3 in older cars. BTW Dot3 has a higher boiling point than any brake fluids of the 60s & 70s.
With less moisture absorption the need to flush & change it can be spread out over a few more years. Also being more viscous it tends to weep (leak) less from any slightly worn cylinder bores or rubbers.
Take a leaf out of Toyota engineering's books. The recommended brake fluid in many recent Landcruiser & other off-road models is Dot3. If it's good enough for those guys it's good enough for me.
Dr Terry |
If at first you don't succeed, just call it Version 1.0 |
 2 users thanked Dr Terry for this useful post.
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