Home > Series Land Rovers > Braking issue, probably hydraulic? |
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TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 1073 |
Normally when you don't apply the brakes there is an open path from each caliper through the master cylinder to the brake reservoir. Once you apply the brakes and the MC plunger moves it closes this path and starts building pressure.
Maybe your brake pedal is poorly adjusted with the plunger slightly engaged closing this free path even when you dont apply the brake. As thing heat up a bit the pressure cannot escape putting a slight pressure on the system causing some braking and when you try to brake you are immediately pushing against pressure. There are adjustment options in the linkage and there are some documented dimensions you can check, but I would start with checking if there is any free play in the MC pushrod and check if fluid can flow freely. On modern cars it all just fits right, on Series/Defenders some fetteling might be required. One other thing is that there are different brake systems and while the MCs can be interchangeable it is not necessarily a match. You have drum brakes in different sizes, disc brakes - normally not, and then you have single and dual systems and power assist or not. The fluid volumes and pressures required to make each of them work right are different so you need to make sure you have the right MC for your brakes or else you have too much fluid and low pressure or too little fluid and too much pedal travel |
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8th Nov 2024 4:19pm |
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jpboost Member Since: 13 Apr 2021 Location: Gatwick Posts: 377 |
Hmm, that's an interesting bit of information. Thank you.
I'd not considered linkage etc, as it's been working well in this setup for 5+ years, but it's worth me checking. Master cylinder size/bore is a bit of an odd one. I swapped from drums to discs all round, and I fully expected to have to change the master for exactly the reasons you mention. But when the axles went on, I connected everything up to the original hydraulics (to get a baseline of how it felt, pedal travel etc) and it was absolutely spot on. |
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8th Nov 2024 4:50pm |
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Gareth Member Since: 12 Dec 2011 Location: Bramhall Posts: 1105 |
+1 for the pushrod to master cylinder adjustment. You need a bit of free play. The intermittency of it says that’s the cause. If it was a mismatch of components I’d expect it to be more consistent. 2021 Defender 110 X-Dynamic HSE D300 MHEV
1966 S2a 109 aka Betsy 1968 S2a 88 aka Bob 2014 Jaaaag F Type 3.0 Supercharged. |
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8th Nov 2024 4:55pm |
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