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Discussion Starter #1
i just put a K&N air filter in my truck and since then i have been noticing my brakes being really sensitive the first min. or so that i start it up. i don't think it is the new filter but i have ABS brakes and a guy i know said that the brake fluid for rangers gets thicker when it gets cold and thats why but i was wondering if anyone else has had that problem or thinks they know what it is? i first noticed it when i was in a parking lot right after i started up my truck and i was slowing down for a stop sigh and my front just like locked up really fast.
 

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Well, mine do that when I first start driving it after its had time to cool off. Only happens in the winter and especially when the brakes are moist. I think its the pads and rotors being cold/ wet. When you first hit the brakes it doesnt quite grab it and then it locks them up cuz it all of a sudden gets good friction. Normal for me to have that happen for the past 3 years that ive payed attention.
 

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It could be sensitive because the brake booster uses engine vacuum. With the new filter, more air is drawn in to the engine which could cause the booster to get more air. Don't know why it is only for the first minute or two though.
 

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Do you have a retune on the truck with a programmer with the new intake programmed in? If not the computer may not know how to handle the intake and how the vacuum reacts.... any thoughts?
 

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Discussion Starter #5
no but i think you where right the fist time cuz it had been raining and i haven't noticed it other than when they are wet and cold.
 

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yeah man, it doesnt do it to me in the spring and summer months. just late fall and winter.
 

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Discussion Starter #7
is it the air compression or the brake fluid getting thicker that does it? has anyone tried changing out the brake fluid?
 

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I think its 30,000 miles that the brake fluid should be changed. Acid can develop from the constant compression and eat away at the brake line o-rings.

its occuring because the brakes need to be warmed to get a good smooth grip. Plus when you leave the vehicle sit in wet weather for a few hours rust forms on the rotors. This is normal but the wet cold brakes will lock for a few times because its trying to both warm up everything and get that rotor back to a non-rust surface. Theres no way to really prevent it.
 

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Another reason why brake fluid should be changed every so often is because it absorbs water and when it absorbs it decreases its ability to perform as it should. It could also start rusting your calipers due to the water. :(
 

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Good call West. Didnt even cross my mind when i want typing that!
 
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