{"product_id":"brake-master-cylinder-reservoir-cover-diaphragm-gasket","title":"Brake Master Cylinder Reservoir Cover Diaphragm \/ Gasket","description":"\u003cp data-start=\"0\" data-end=\"276\" class=\"PDq2pG_selectionAnchorContainer\"\u003eThis is an \u003cstrong data-start=\"11\" data-end=\"75\"\u003eOEM brake master cylinder reservoir cover diaphragm \/ gasket\u003c\/strong\u003e for 1986–1987 Buick Grand National and Turbo Buick applications, designed to seal underneath the brake fluid reservoir lid and help keep brake fluid contained and protected from outside contamination.\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"491\" data-end=\"634\"\u003eThis gives you a factory-style replacement option for freshening up your original brake reservoir setup without swapping out unnecessary parts.\u003c\/p\u003e\n\u003cp data-start=\"636\" data-end=\"681\"\u003e⬛ \u003cstrong data-start=\"638\" data-end=\"681\"\u003eOEM Part – Factory Brake Reservoir Seal\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"683\" data-end=\"1134\"\u003e\u003cstrong data-start=\"683\" data-end=\"702\"\u003eWhy You Want It\u003c\/strong\u003e\u003cbr data-start=\"702\" data-end=\"705\"\u003eBecause the little rubber pieces matter. This diaphragm\/gasket sits under the brake fluid reservoir cover and helps the lid seal properly. Over time, the original gasket can get swollen, hard, distorted, cracked, or weak from age and brake fluid exposure. When that happens, you can end up with brake fluid seepage around the reservoir lid, moisture getting into the system, or just a messy engine bay around the master cylinder.\u003c\/p\u003e\n\u003cp data-start=\"1136\" data-end=\"1428\"\u003eIf you’re restoring, servicing, or cleaning up the brake system on your Turbo Buick, this is one of those small OEM pieces that helps keep everything looking and functioning the way GM intended. Perfect for someone trying to keep their Powermaster brake setup complete, correct, and original.\u003c\/p\u003e\n\u003cp data-start=\"1430\" data-end=\"1541\"\u003eThis is an OEM used part with normal wear from age and use. Please review all photos closely before purchasing.\u003c\/p\u003e\n\u003cp data-start=\"1543\" data-end=\"1768\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eAll parts are sold as-is with no returns, refunds, or exchanges. Buyer is responsible for verifying fitment for their specific application prior to purchase. Turbo 6 Parts makes no performance guarantees. All sales are final.\u003c\/p\u003e","brand":"Watts Performance Solutions","offers":[{"title":"Default Title","offer_id":43473845518399,"sku":"Ask Dev","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0570\/2310\/3039\/files\/ScreenShot2026-06-30at5.59.24PM.png?v=1782857293","url":"https:\/\/wattsperformance.com\/products\/brake-master-cylinder-reservoir-cover-diaphragm-gasket","provider":"Watts Performance Solutions","version":"1.0","type":"link"}